Why Your Indoor Air Quality Changes in Winter (And How to Fix It)

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When winter settles in across the South Shore, most homeowners focus on staying warm and keeping heating bills under control. What often gets overlooked is how colder weather can quietly impact your indoor air quality (IAQ)—sometimes in ways you can feel almost immediately.

Dry air, closed windows, and heating systems running nonstop all contribute to changes inside your home. If you’ve noticed more dust, dry skin, allergy flare-ups, or lingering odors during the winter months, your indoor air quality could be the culprit.

Let’s break down why indoor air quality changes in winter—and more importantly, what you can do about it.

Why Indoor Air Quality Gets Worse in Winter

1. Your Home Is Sealed Tighter Than Ever

During winter, homes naturally become more airtight. Windows stay shut, doors remain closed, and fresh outdoor air has fewer opportunities to circulate indoors. While this helps with energy efficiency, it also traps indoor pollutants like dust, pet dander, cooking odors, and airborne allergens.

Without proper ventilation, these contaminants build up over time, reducing overall air quality and making your home feel stale.

2. Heating Systems Dry Out the Air

Forced-air heating systems are great for keeping your home comfortable, but they also remove moisture from the air. Low humidity levels can lead to:

  • Dry skin and irritated eyes
  • Scratchy throats and sinus discomfort
  • Increased static electricity
  • Cracked wood floors and furniture

Dry air can also make viruses spread more easily, which is why winter often feels like the cold and flu season indoors.

3. Dust and Allergens Circulate More Frequently

When your heating system runs consistently, it pushes air through your ductwork multiple times a day. If your ducts or air filters are dirty, dust and allergens get redistributed throughout your home.

This is especially problematic for households with asthma, allergies, or pets.

How to Improve Indoor Air Quality This Winter

The good news? Improving winter indoor air quality doesn’t require major renovations—just the right solutions.

Upgrade Your Air Filtration

One of the simplest and most effective ways to improve IAQ is by upgrading your HVAC air filter. High-efficiency filters capture smaller particles, reducing dust, pollen, and other airborne irritants.

McClaren HVAC offers guidance on selecting the right filtration options for your system as part of their comprehensive indoor air quality solutions.

Add a Whole-Home Humidifier

A whole-home humidifier works directly with your heating system to maintain balanced humidity levels throughout your house. This helps:

  • Relieve dry skin and sinus issues
  • Reduce static electricity
  • Protect wood furnishings
  • Make your home feel warmer at lower thermostat settings

Balanced humidity can significantly improve comfort while also protecting your home’s interior during harsh New England winters.

Schedule HVAC Maintenance

Routine heating maintenance plays a bigger role in air quality than most homeowners realize. During a professional tune-up, technicians inspect components, clean buildup, and ensure your system is circulating air efficiently and safely.

Regular service helps prevent dust accumulation and improves overall system performance. Learn more about McClaren HVAC’s trusted heating services and seasonal maintenance options.

Consider Air Purification Systems

For homes with allergies, pets, or lingering odors, air purification systems can be a game-changer. These systems actively remove contaminants from the air, neutralizing bacteria, mold spores, and other pollutants that standard filters may miss.

An experienced HVAC professional can help determine whether an air purifier is a good fit for your home and existing system.

Why Homeowners Trust McClaren HVAC

For decades, McClaren Heating & Air Conditioning has helped South Shore homeowners stay comfortable through every season. Built on honesty, craftsmanship, and long-term relationships, their team takes a personalized approach to every home they serve.

You can learn more about their commitment to quality and customer care on the About McClaren HVAC page.

Breathe Easier This Winter

If your home feels drier, dustier, or less comfortable during the winter months, your indoor air quality may need attention. From better filtration to humidity control and professional maintenance, small improvements can make a noticeable difference.

McClaren HVAC is here to help you create a healthier, more comfortable home—no matter how cold it gets outside.

Ready to improve your indoor air quality this winter? Contact McClaren Heating & Air Conditioning to schedule a consultation and start breathing easier all season long.

The Ultimate Winter HVAC Maintenance Checklist for South Shore Homeowners

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Winters on the South Shore can bring everything from freezing temperatures to heavy snow and coastal winds — and your heating system feels the impact long before you do. A little preparation goes a long way in keeping your home warm, comfortable, and energy-efficient all season long.

Whether you’re relying on a furnace, heat pump, or a hybrid heating setup, winter is when your HVAC system works its hardest. That’s why routine maintenance is essential — and why McClaren Heating & AC offers professional tune-ups, cleanings, and maintenance plans designed specifically for Massachusetts winters.

Here’s the ultimate checklist to make sure your system is ready for whatever the season brings.

1. Replace or Clean Your Air Filter

Your air filter is your first line of defense against dust, pet dander, and debris. When it’s clogged, your heating system has to work significantly harder — which leads to:

  • Higher energy bills
  • Reduced airflow
  • Colder rooms
  • Increased wear and tear

During winter, especially if your system runs frequently, replace your filter every 1–3 months.

If your furnace seems louder than usual or your home feels less warm, a dirty filter is often the culprit.

2. Clear and Open All Vents

Closed or blocked vents can disrupt the balance of your entire HVAC system. Before the cold weather hits:

  • Make sure all vents are open
  • Move furniture away from airflow
  • Clean off dust and debris from vent covers

Blocked vents cause your system to work harder, reduce heating efficiency, and can even trigger safety shut-offs.

3. Check Your Thermostat Settings

Your thermostat plays a big role in winter comfort. Look for:

  • A dead or low battery
  • Loose wiring (if visible)
  • Proper settings for your home schedule

If you don’t already have one, winter is a great time to upgrade to a programmable or smart thermostat. These models help maintain consistent temperatures without wasting energy.

McClaren can help install and configure modern thermostats so your home stays warm with minimal effort.

4. Inspect and Clear the Area Around Your Furnace

Your furnace needs room to “breathe.” Items stored too close can block airflow or create a fire hazard.

Be sure to keep at least 3 feet of clearance around:

  • The furnace cabinet
  • The intake area
  • The burner compartment

If your furnace is tucked away in a basement corner or utility room, it’s especially important to keep the surrounding area clutter-free.

5. Ensure Your Heat Pump Is Clear of Ice and Snow

If you heat your home with a heat pump (or have a dual-fuel system), winter can take a toll on your outdoor unit.

Check that your:

  • Unit is free of snow buildup
  • Drainage area isn’t blocked
  • Coils are free of heavy ice

Some frost is normal, but if your unit is encased in ice or not defrosting properly, call McClaren. A frozen heat pump puts major strain on your system and can cause it to shut down.

6. Seal Drafts Around Windows and Doors

Even the strongest heating system struggles if warm air is constantly escaping. A quick walk-through can make a big difference.

Look for:

  • Cold drafts near doors
  • Whistling windows during windy days
  • Gaps in weather stripping

Simple fixes like caulking, replacing worn seals, or adding temporary insulation can reduce heat loss dramatically.

7. Check Your Carbon Monoxide and Smoke Detectors

Whenever you’re running a heating system — especially one that burns fuel — working CO and smoke detectors are essential.

Before winter:

  • Replace batteries
  • Test each device
  • Replace detectors older than 10 years

If your furnace has any combustion issues, these detectors could be life-saving.

8. Schedule a Professional Winter Tune-Up

Even if your system seems to be working fine, annual maintenance is one of the best ways to catch small problems before they turn into expensive repairs.

A McClaren winter tune-up typically includes:

  • Inspecting burners and electrical components
  • Cleaning furnace or heat pump components
  • Checking airflow and ductwork condition
  • Lubricating moving parts
  • Verifying safe operation
  • Ensuring maximum efficiency

Many of the issues that lead to winter breakdowns — faulty ignitors, dirty flame sensors, weak blower motors — can be prevented with proper maintenance.

9. Consider a Maintenance Plan for Year-Round Coverage

If you want worry-free heating and cooling, a McClaren maintenance plan is the easiest way to protect your system throughout the year.

Benefits often include:

  • Seasonal tune-ups
  • Priority service
  • Discounts on repairs
  • Extended equipment lifespan
  • Improved efficiency and comfort

With a plan in place, you never have to remember when it’s time for maintenance — McClaren keeps you on schedule.

Stay Warm and Prepared All Winter Long

Taking care of your HVAC system before winter hits can mean fewer breakdowns, lower heating bills, and a much more comfortable home. Whether you need a quick tune-up, a deep cleaning, or expert help diagnosing a noisy furnace, McClaren Heating & AC is here to help.

Call McClaren Heating & AC today at 781-447-0136 or schedule your winter tune-up online.
Our team is ready to make sure your home stays warm, safe, and comfortable all season long.

Why Your Furnace Struggles in Extreme Cold (and When to Call an Expert)

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When the temperature drops into single digits here in Massachusetts, your furnace becomes the hardest-working appliance in your home. But during those bitter cold snaps, even a reliable heating system can start to struggle — running longer than usual, delivering uneven heat, or failing to keep up entirely.

If you’ve ever wondered why your furnace seems to fall behind when the weather turns extreme, you’re not alone. Here’s a closer look at what’s happening behind the scenes, what’s normal, what’s not, and when it’s time to call in the experts at McClaren Heating & AC.

Why Furnaces Struggle During Extreme Cold

Your furnace is designed to maintain a comfortable indoor temperature based on typical winter weather. But when outdoor temperatures dip far below average, your system has to work significantly harder to keep up. Several factors contribute to this:

1. Heat Loss Happens Faster

The colder it is outside, the faster the heat escapes from your home — especially if:

  • You have older windows
  • Your insulation isn’t adequate
  • There are drafts around doors or attic spaces

Even a high-efficiency furnace can struggle to replace heat at the same rate it’s escaping.

2. Your Furnace Runs Longer Than Normal

During extreme cold, it’s normal for your furnace to run almost constantly. It doesn’t necessarily mean something is wrong — it’s just battling a much larger temperature difference than usual.

However, long runtimes can stress older systems and expose underlying issues.

3. Your System Has a Maximum Heating Capacity

Every furnace has what’s called a “design temperature limit,” meaning there’s a lowest outdoor temperature it’s built to manage while still maintaining your thermostat setting.

When the outside temperature drops well below that point, your home may:

  • Stall a few degrees below the thermostat setting
  • Have cooler rooms on upper floors
  • Feel draftier than usual

Again, this may be normal — but if temperatures drop dramatically, the furnace can’t always keep up on its own.

4. Small Problems Become Big Problems Quickly

A furnace that might run “mostly fine” during mild weather can struggle once pressured by extreme cold. Issues like a dirty filter, weak airflow, or a failing part suddenly become much more noticeable, and sometimes cause the system to shut down altogether.

Signs Your Furnace Is Just Working Hard (Not Failing)

Some symptoms are totally normal during cold snaps. For example:

  • Your furnace runs almost nonstop
  • Your home stays warm but hits a degree or two below your thermostat setting
  • You hear airflow more frequently because the blower is running longer
  • Rooms furthest from the furnace feel slightly cooler

If your system has been maintained recently and you’re still getting steady heat — even if it’s working harder — you may not need a repair.

Signs It’s Time to Call an Expert

That said, extreme cold is when real furnace issues tend to show up. Call a professional right away if you notice:

Your furnace is blowing cold air

This often points to:

  • A failing ignitor
  • Fuel supply issues
  • Overheating due to restricted airflow

Short cycling (turning on and off repeatedly)

This wastes energy and often signals a failing component or airflow restriction.

Unusual noises

Grinding, banging, squealing, or rumbling sounds should never be ignored.

Burning smells or electrical odors

Turn off the furnace and call for emergency service immediately.

Certain parts of your home have no heat at all

This may be a ductwork issue, a failing blower motor, or a clogged filter.

Your furnace won’t turn on

During extreme cold, this becomes an urgent situation — especially overnight.

If you’re ever unsure whether something is normal, it’s better to have a technician check it than risk a full breakdown in subzero temperatures.

How to Help Your Furnace Keep Up

While you can’t control the weather, you can help your furnace operate more efficiently.

Try:

  • Changing your air filter (every 1–3 months in winter)
  • Opening all vents and making sure none are blocked
  • Lowering your thermostat by 1–2 degrees during peak cold periods
  • Running ceiling fans clockwise to push warm air down
  • Sealing drafts around windows and doors

These small steps can reduce strain and help maintain more consistent heat.

When You Need Help Fast — McClaren Is Here 24/7

A furnace breakdown during extreme cold isn’t just inconvenient — it can be dangerous. That’s why McClaren Heating & AC offers:

  • 24/7 emergency furnace repair
  • Same-day service appointments
  • Fast diagnostics and upfront pricing
  • Fully stocked service trucks for quick repairs

Whether your furnace is falling behind, making strange noises, or has stopped working altogether, our licensed technicians are ready to restore your heat quickly and safely.

Stay Warm — No Matter How Cold It Gets

Extreme cold can push even a well-maintained furnace to its limits. If your system is struggling, showing signs of failure, or has shut down completely, don’t wait. The longer you go without heat, the harder it can be on your home — and your family’s comfort.Need immediate help? Call McClaren Heating & AC anytime at 781-447-0136.
We’re available around the clock to keep your home warm and safe during even the harshest winter weather.

One-Stage or Two-Stage Furnace: Which Is Better?

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When installing a new furnace or replacing your old one, there are several models to choose from. However, most are either a one-stage or two-stage furnace. What does this mean, and which kind of furnace is the best for Massachusetts homes? Keep reading for the answer.

Understanding the Difference Between Furnace Stages

The stages of a furnace refer to how many heating levels it has. A single-stage furnace operates at one heating level, while a two-stage furnace has both a lower-level heating function and a higher one for chillier days. A one-stage furnace always operates at full capacity if it’s on, but a two-stage unit can automatically raise or reduce its capacity according to outdoor conditions.

How Efficient Is a Two-Stage Furnace Compared to a One-Stage Unit?

Typically, a one-stage furnace uses more energy since it runs at full capacity no matter how cold it is outside. This type of furnace only turns on and off to control the temperature in your home, which tends to use more energy.

Since a two-stage furnace can adapt itself to different conditions, it uses less energy when the weather is mild. This lets you save electricity when you don’t need as much heat. Even though a two-stage furnace can be more expensive upfront, it generally pays for itself over time in terms of lower utility bills.

How Much Noise Does Each Unit Make?

One-stage furnaces may be loud at times, especially when they’re running at full capacity. You may hear the furnace cycle on and off as it adjusts to maintain your desired home temperature.

Two-stage furnaces are usually quieter, since they stay on the lowest setting unless it’s very cold. It’s also harder to notice when a two-stage furnace changes settings, since the fan speed is what gets adjusted instead of the whole system turning off and back on.

How Does Each Type of Furnace Perform in Cold Weather?

Both one- and two-stage furnaces perform well in cold weather with proper maintenance. The biggest deciding factor is whether the furnace you choose is appropriately sized for your space. Regardless of which type of furnace you get, if it’s too small or too large for your house, you won’t get the performance you need. 

Additionally, two-stage furnaces tend to be better at air filtration, since run cycles are longer and filter your air for an extended period. One-stage furnaces with shorter run cycles provide less filtration, but you can offset this with an advanced filter.

Which Is the Best Kind of Furnace for My House?

A one-stage furnace is suitable for small apartments and houses with open layouts or those that are well-insulated. You can get reliable heating at a lower upfront cost, which also makes it ideal for furnace replacements if your heating system suddenly goes out.

A two-stage furnace can be a better investment for larger houses with lots of rooms with doors or for households that want to save the most money on their electric expenses. These systems are also ideal for the Massachusetts area, since our winters tend to be longer and colder than many areas of the United States. 

Due to a two-stage furnace’s ability to select which setting to use, this type of system can keep your home as warm as you want it while using the least amount of energy possible.

Quick Comparison

FeatureOne-Stage FurnacesTwo-Stage Furnaces
OperationRuns at 0% or 100%Runs at 0%, ~60%, and 100%
Energy EfficiencyLowerHigher
ComfortMay notice temperature changesIndoor temps are more consistent
NoiseHigherLower
Initial CostLowerHigher
Ongoing CostsHigherLower
LifespanShorterLonger
Air QualityLowerHigher

Stay Warm This Winter with McClaren Heating & Air Conditioning

If you need a new furnace or are choosing a system for new construction, McClaren Heating & Air Conditioning can help. Our team will visit your home to calculate your square footage and assess your heating needs so we can recommend the best system to fit your space.

Contact us today by calling 781-447-0136 or click here to get a quote online.

HVAC technician installing an AC unit.

Exploring the Differences Between Ductless HVAC and Traditional Heating and Cooling

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If you’ve heard about ductless HVAC systems, you may be wondering about the differences between a mini split and traditional heating and cooling. Below, we take a detailed look at the advantages and disadvantages of each kind of technology and how you can get connected with experienced South Shore HVAC providers who can help.

Comparing Tech

Technology never stops changing, no matter what industry you’re looking at. The same can be said of heating and cooling systems. Today’s tech offers more advanced home comfort than ever before, with smart sensors and programmable thermostats that let you “set it and forget it.”

Choosing between systems can be tough though, because most homeowners are on some kind of budget when upgrading or replacing their HVAC equipment. Understanding what each system brings to the table is a great way to narrow down your selection.

Advantages and Disadvantages of Each

Like any heating or cooling appliance, there are advantages and disadvantages of both mini splits and central HVAC systems. Let’s take a closer look:

Ductless Heat Pumps

Ductless units get their name because they provide heating and cooling without the need for ductwork. They don’t make heat, even in the winter. Instead, these systems use advanced technology to move heat from inside your home to the outside and vice versa.

You might not think that there’s any heat outside in the winter to extract, but you’d be surprised. Many ductless units can heat your home comfortably in temperatures as low as -13 degrees Fahrenheit!

Pros:

  • More energy-efficient than any other HVAC system currently available
  • Can heat your home down to -13 degrees Fahrenheit or lower
  • Heating and cooling come from the same system
  • Superior filtration offers better indoor air quality

Cons:

  • Upfront installation cost can be higher compared to over-the-counter buys like space heaters or window ACs

To help reduce the cost of switching to ductless equipment, Mass Save offers a rebate for new owners that can shave thousands off your total installation expenses. Plus, we work with Synchrony Financing to offer flexible and affordable payment options that allow you to defer the rest of the cost over the course of several months.

Central HVAC

Central HVAC technology is older than ductless but has proven to be a reliable form of heating and cooling over time. Many homes in South Boston continue to use central heat and AC either as their primary or backup system and today’s modern equipment boasts high efficiency ratings and low operating costs.

Pros

  • Heat and cool your entire house with one system
  • Vents are unobtrusive and are flush with the floor or wall
  • More efficient than gas, wood, or oil heating

Cons

  • Heat energy is lost through your ducts on its way from your system to you
  • Ducts are dusty and can contaminate your air with debris and particulate matter
Window Air Conditioners

Window ACs are small appliances that fit in most standard-size windows and provide fast cooling for small spaces. These units are usually available for purchase at hardware and department stores in the summer.

Pros

  • Small, portable, and easy to move around
  • Affordable and available

Cons

  • Loud and musty smelling
  • Expensive to run
  • Short lifespan
Oil, Gas, and Wood Heat

Wood and oil heat are some of the oldest forms of heating on the Eastern Shore of Massachusetts. Gas heating isn’t far behind. Most homes in the area use one of these systems as their primary or backup heating source if the owners aren’t using a central system or ductless unit.

Pros

  • Burning gas and wood creates heat quickly
  • Oil creates radiant heat which warms your home evenly throughout
  • Wood is usually cheap and may be readily available if you live in a rural area
  • Gas furnaces don’t require a large oil or propane tank if connected to a city gas line
  • Oil and gas heaters can last 25 years or more; wood stoves often last even longer

Cons

  • Gas furnaces tend to be more expensive to install than oil furnaces and wood stoves
  • Gas and wood heat create dangerous carbon monoxide as a byproduct
  • Gas leaks are critical and pose a safety and health hazard to occupants

These disadvantages of these systems can often be mitigated with regular maintenance and awareness of what signs to look for that can indicate a potential emergency. However, both central and ductless heating and cooling are generally more energy-efficient, cost-effective, and healthier for your home and the environment.

When to Reach Out to a Qualified South Shore HVAC Specialist

If you’re considering switching to ductless HVAC or just have a few questions to ask about heating and cooling your home, our technicians can help. Contact us today to learn more or to schedule an appointment by calling (781) 447-0136. We service the towns of Weymouth, Bridgewater, West Bridgewater, Plymouth, and surrounding areas on the South Shore.