Massachusetts winters can be tough—not just on people, but on your home’s HVAC equipment too. Snowstorms, ice buildup, freezing temperatures, and even road salt can take a toll on outdoor units if they’re not properly protected. While many homeowners focus on keeping warm indoors, taking a few smart steps to care for your outdoor HVAC components can help prevent damage, improve performance, and extend the life of your system.

Here’s what every South Shore homeowner should know about protecting outdoor HVAC equipment during winter.

Why Outdoor HVAC Equipment Needs Winter Protection

Even though your air conditioner isn’t running in winter, its outdoor condenser unit remains exposed to the elements. Heat pumps, which operate year-round, face even more winter wear and tear. Snow accumulation, ice, and salt spray from nearby roads or walkways can all cause corrosion, restricted airflow, or mechanical issues if left unchecked.

The good news? A little preventative care goes a long way.

Best Practices for Protecting Outdoor Units in Winter

1. Keep Snow and Ice Clear

After heavy snowfall, gently clear snow away from your outdoor unit. Snow buildup can block airflow and put extra strain on heat pumps that need clear air circulation to operate efficiently. Avoid using metal shovels or sharp tools—these can damage delicate fins or coils.

If ice forms on or around the unit, never chip it away. Instead, allow it to melt naturally or contact a professional if ice buildup becomes excessive.

2. Elevate the Unit if Needed

Outdoor units should sit above the average snow line. If your unit is older or installed low to the ground, it may be vulnerable to snow drifts and melting ice refreezing underneath. Elevated platforms help prevent ice buildup and reduce moisture-related damage.

3. Watch for Salt Exposure

In Massachusetts, road salt is unavoidable—but it’s also corrosive. Salt spray from nearby driveways, roads, or walkways can accelerate rust on coils and metal components. If your unit is close to salted areas, gently rinse the exterior with fresh water (when temperatures allow) to reduce residue buildup.

4. Trim Nearby Branches

Winter storms often bring heavy, wet snow that can snap tree limbs. Trimming branches near your outdoor unit helps prevent falling debris from damaging the equipment or blocking airflow.

Should You Cover Your Outdoor AC Unit?

This is one of the most common winter HVAC questions—and the answer isn’t as simple as yes or no.

The Pros of Covering an AC Unit

According to HVAC professionals and home experts like Better Homes & Gardens, covering the top only of an outdoor AC unit can:

• Help prevent debris, leaves, and ice from accumulating inside
• Reduce exposure to falling icicles or heavy snow
• Limit moisture from repeatedly freezing and thawing inside the unit

If you choose to cover your unit, breathable covers designed specifically for HVAC equipment are best.

The Cons of Covering an AC Unit

Improper covers can actually cause more harm than good. Fully wrapping or tightly sealing an AC unit:

• Traps moisture, increasing the risk of corrosion
• Creates a nesting place for rodents and pests
• Restricts airflow, which can damage components if the unit is a heat pump or mistakenly turned on

Plastic tarps or non-breathable materials are especially problematic. If moisture can’t escape, you may end up with rusted coils or electrical issues come spring.

What About Heat Pumps?

If your home uses a heat pump, never cover it. Heat pumps need open airflow year-round to function properly, even during freezing temperatures. Covering a heat pump can lead to poor performance, system shutdowns, or long-term damage.

Instead, focus on keeping snow and ice clear and scheduling professional maintenance to ensure defrost cycles are working correctly.

The Importance of Professional Winter Maintenance

One of the best ways to protect your outdoor HVAC equipment is through routine maintenance. A professional inspection ensures:

• Coils are clean and corrosion-free
• Drain lines are clear
• Electrical connections are secure
• The system is ready to handle extreme cold

At McClaren Heating & Air Conditioning, our technicians understand the challenges of South Shore winters and know how to keep your equipment running safely and efficiently.

Protect Your System—and Your Investment

Your HVAC system is one of the biggest investments in your home. Taking the right steps to protect outdoor equipment during winter can help prevent unexpected repairs, extend system life, and ensure reliable comfort year after year.

If you’re unsure how to protect your outdoor unit—or want peace of mind heading into winter—McClaren Heating & Air Conditioning is here to help.

📞 Call (781) 447-0136 today to schedule maintenance or speak with one of our HVAC experts about winter system care.

You can’t control the Massachusetts weather—but you can control how well your HVAC system handles it.