The first big snow in Ontario never gives much warning. One day it is a cold rain. The next day, outdoor units are buried under a heavy blanket.

For HVAC contractors, that means a wave of calls. Heat pumps iced over. Fans blocked. Coils packed with snow. Condensers knocked sideways by falling ice from the roof.

Most of these calls are avoidable. A little prep in the fall prevents a lot of trouble in January.

This guide covers how to protect every outdoor unit before the first snowfall. It also lists the materials Ontario contractors should have ready.

Why Outdoor Units Need Winter Prep

Outdoor units live in tough conditions. They face snow, freezing rain, wind and ice all winter.

Heat pumps have it hardest. They run all winter, and they go through defrost cycles in cold, damp weather. That is normal. But the unit needs clear airflow and good drainage to do it well.

Air conditioners face different risks. They sit idle for months. Snow, ice and debris can damage fins, fans and wiring.

Here is what can go wrong without prep:

• Blocked airflow. Snow and ice around the unit reduce performance.
• Ice build-up. Poor drainage lets melt water freeze at the base.
• Physical damage. Falling ice and heavy snow can bend coils and crush panels.
• Corrosion. Salt, moisture and debris wear down metal over time.
• Service calls. Every one of these problems ends with a truck roll.

1. Check the Mounting First

Good protection starts with where the unit sits.

Walk the site. Ask a few simple questions:

• Is the unit raised above the usual snow line?
• Is the pad level and stable?
• Is there a clear path for water to drain away?
• Is the unit under a roof edge, eave or gutter?

A unit sitting on the ground can get buried fast. A raised stand or wall bracket keeps it above drifts. For heat pumps, extra height also gives melt water room to drain.

If a pad has settled or shifted, fix it now. A tilted unit drains poorly and can strain refrigerant lines.

2. Watch the Roof Above the Unit

Roof run-off is a common cause of damage. Melting snow slides off. It drips. It freezes.

Look at what sits above the unit:

• Eaves that shed snow and ice onto it
• Gutters that overflow or drip nearby
• Downspouts that empty close to the pad

If there is a risk, you have a few options:

• Move the unit if the site allows it.
• Add a protective hood or shield above it.
• Redirect downspouts or gutters.
• Suggest snow guards on the roof.

Never block airflow with a cover. Any shield should sit above the unit, not wrap around it.

3. Clear the Space Around the Unit

Airflow matters all year. In winter, it matters even more.

Leave enough space around each unit. Follow the manufacturer’s clearance requirements. Many units need a generous gap on all sides.

Before the first snow, clear away:

• Leaves, grass clippings and debris
• Overgrown shrubs and branches
• Stored items, such as bins and firewood
• Fencing or panels that crowd the unit

Tell your customers, too. A short note on the invoice goes a long way. “Please keep at least [clearance] around the unit all winter” prevents a lot of problems.

4. Plan for Drainage and Defrost

Heat pumps shed a lot of water in defrost. That water needs a place to go.

Check these points:

• Base clearance. Keep the base free so water can drain away.
• Pad slope and surface. Water should not pool under the unit.
• Drain pan or base heater, if the model uses one. Follow the manufacturer’s guidance.
• Nearby walkways. Melt water can freeze into ice on paths and steps.

Think about where water will run, and where it will refreeze. A little thought now prevents ice patches and unhappy customers.

5. Protect Lines, Wiring and Connections

The unit is only part of the picture. Lines and connections face winter too.

Inspect these items:

• Line set insulation. Replace cracked or damaged insulation.
• UV and weather wrap. Sun and cold break down cheap materials.
• Disconnects and whips. Check for corrosion, loose fittings and damaged conduit.
• Wall penetrations. Seal gaps to stop moisture and pests.
• Condensate lines. Insulate or heat-trace any exposed runs that could freeze.

These are quick checks. They are also easy to forget. Add them to your fall checklist.

6. Inspect the Unit Itself

A fall inspection is a good chance to catch small issues before winter.

Look at:

• Coils and fins. Clean off dirt and debris. Straighten bent fins carefully.
• Fan and motor. Make sure the fan spins freely.
• Cabinet and panels. Check for rust, dents or loose screws.
• Electrical connections. Tighten loose terminals and look for wear.
• Operation. Run the unit and listen for odd noises.

For heat pumps, test heating mode before the cold hits. It is far easier to fix a problem on a mild day than in a deep freeze.

7. Think Before You Cover

Covers are a common question. The answer is not simple.

Heat pumps run in winter. They should never be fully covered while operating. A cover blocks airflow and can cause serious problems.

Air conditioners that are shut down for winter are different. Some contractors recommend a breathable, manufacturer-approved cover or a top-only shield. Others prefer no cover at all.

The safest advice is to follow the manufacturer’s guidance. Avoid plastic wraps that trap moisture. Never cover a unit that is running.

What to Keep in Stock for Fall Protection Jobs

Fall is a good time to review your truck stock. These items come up often:

• Raised stands and wall brackets
• Equipment pads and anti-vibration pads
• Line set insulation and weather wrap
• Sealants and caulk for wall penetrations
• Condensate drain tubing, heat cable and insulation
• Top shields and snow hoods
• Fasteners, anchors and straps
• Replacement fan guards and panels

Having these ready turns a basic maintenance visit into a quick, complete job. It also helps you offer a clear list of options to customers.

A Simple Pre-Snow Checklist for Contractors

Use this quick list on every visit.

1. Check mounting height and pad level.
2. Review the roof and gutters above the unit.
3. Clear debris and confirm clearances.
4. Check drainage and the defrost path.
5. Inspect line sets, wiring and seals.
6. Clean and inspect the unit.
7. Test heating mode on heat pumps.
8. Leave a short care note for the homeowner.

A repeatable routine makes this easy for your crew. It also gives customers a reason to book a seasonal visit.

Frequently Asked Questions

When should outdoor units be prepared for winter?
Do it in the fall, before the first snowfall. Mild weather makes it easier to inspect and fix problems.

Should I cover a heat pump in winter?
No. Heat pumps run in winter and need clear airflow. Never cover a unit while it is operating.

How much clearance does an outdoor unit need?
Requirements vary by model. Always follow the manufacturer’s installation instructions.

What causes ice to build up around heat pumps?
Poor drainage, a tilted pad, roof run-off and blocked airflow are common causes. Raising the unit and managing water helps.

What accessories help protect outdoor units?
Raised stands, wall brackets, top shields, pads, line set insulation and proper drainage parts are common choices.

Where can Ontario contractors get these materials?
Airtek supplies Ontario HVAC contractors. Visit www.airtekshop.com or contact our team to check availability.

Get Ready Before the Snow Falls

Snow is coming. The only question is whether your customers’ units are ready.

A little prep protects the equipment, your reputation and your schedule. It also turns a stressful winter into a smooth one.

Airtek supports Ontario HVAC contractors with the equipment and supplies they need. Browse our catalogue at www.airtekshop.com or contact our team to plan your fall stock today.

Resources:

Natural Resources Canada’s guide, Heating and Cooling with a Heat Pump

Every Fast Installation Starts with the Right Materials