How to Prepare Your HVAC System for Winter Storms

Winter storms don’t wait for anyone. One night, you’re cozy with a mug of cocoa. The next, your pipes are rattling, your furnace is groaning, and the cold is sneaking in through every crack. At Denny’s Heating, we see it every year: frozen pipes, sputtering furnaces, and panicked calls in the middle of the night.

Preparation is more than a checklist—it’s your safety net. Whether you’re a homeowner or running a small business, taking smart steps now can mean the difference between a warm, safe space and a costly emergency. Let’s walk through what you need to know to protect your HVAC system before the next winter storm hits.

What Winter Storms Can Do to Your HVAC System 🥶

Winter storms are more than just a snow day. They can push your HVAC system to its limits. Here are some real risks:

• Freezing Pipes: When temperatures plummet, water in your heating system’s pipes can freeze and burst, causing water damage and system failure.
• Power Outages: Heavy snow and ice can knock out power. Your furnace or heat pump won’t work without electricity.
• System Strain: Your heating equipment works overtime in extreme cold. If it’s not maintained, it can break down under the pressure.
• Blocked Vents and Exhausts: Snow and ice can cover outdoor vents, leading to dangerous carbon monoxide buildup or system shutdowns.
• Poor Indoor Air Quality: Sealed-up homes trap dust, allergens, and moisture, making air quality drop quickly.

Ignoring these risks is like driving on bald tires in a blizzard. It’s not worth it.

Quick HVAC Winter Preparation Checklist

Before the storm clouds roll in, use this checklist to shore up your defenses:

• Schedule a Furnace Inspection: Have a certified technician check your furnace or heat pump for wear, leaks, and safety issues.
• Test Your Thermostat: Make sure it’s working, set to “heat,” and programmed for winter comfort.
• Replace or Clean Filters: Dirty filters choke airflow and strain your system. Change them monthly during heavy use.
• Seal Ducts and Vents: Leaky ducts waste heat. Seal gaps with mastic or foil tape (not duct tape).
• Clear Outdoor Units: Remove snow, ice, and debris from around heat pumps and exhaust vents.
• Check Carbon Monoxide Detectors: Replace batteries and test alarms to prevent dangerous gas buildup.
• Inspect Insulation: Add insulation to exposed pipes and attics to keep heat in and cold out.
• Prepare Generators: If you have a backup generator, test it and stock up on fuel. Know how to use it safely—never run indoors.
• Review Emergency Supplies: Keep blankets, flashlights, and bottled water handy in case of outages.

Following this list is like putting on a heavy coat before heading into a snowstorm—it’s your first line of protection.

DIY or Call a Pro? Knowing Your Limits

Some maintenance tasks are safe for handy homeowners. Others are best left to certified technicians. Here’s how to tell:

DIY-Friendly:

• Changing filters
• Clearing snow from outdoor units
• Checking thermostat batteries
• Sealing simple duct leaks with approved materials

Call a Pro For:

• Furnace inspections and tune-ups
• Electrical work (wiring, circuit checks)
• Gas line checks or repairs
• Diagnosing strange noises, smells, or error codes
• Generator installation or maintenance

If you’re ever unsure, err on the side of caution. HVAC systems are complex, and mistakes can be dangerous. The National Fire Protection Association (NFPA) and the Air Conditioning Contractors of America (ACCA) both recommend professional servicing for annual maintenance and repairs.

What Happens When a Pro Arrives

When you call Denny’s Heating for emergency hvac service, here’s what you can expect:

• Thorough Inspection: We check for worn parts, leaks, and safety hazards using industry-standard tools.
• System Testing: We run your system through its paces—heating, cycling, and airflow—to catch hidden problems.
• Safety Checks: Carbon monoxide levels, gas connections, and electrical safety are all reviewed.
• On-the-Spot Repairs: If it’s safe and possible, we fix issues right away to restore heat and comfort.
• Advice for Prevention: We’ll explain what happened, how to avoid it next time, and what to watch for.

Our technicians are trained to follow codes set by organizations like the International Code Council (ICC) and Occupational Safety and Health Administration (OSHA), so you can trust the work is done right.

Preventative Maintenance: Your Best Defense

A little prevention goes a long way. Here’s how to keep your system running strong all winter:

Regular Filter Changes

A clogged filter is like trying to breathe through a scarf. Change or clean filters every 1–3 months, especially during heavy use.

Annual Inspections

Schedule a professional tune-up every fall. This helps catch small issues before they become emergencies.

Duct Sealing and Insulation

Leaky ducts lose heat and money. Seal and insulate ducts, especially in attics or crawl spaces, to boost efficiency.

Test Your Generator

If you rely on a backup generator, run it monthly. Check fuel, oil, and connections. Never operate it in enclosed spaces.

Smart Thermostat Settings

Set your thermostat to a consistent, energy-saving temperature. Avoid dramatic swings—steady heat is easier on your system.

Keep Vents Clear

Make sure furniture, rugs, or snow aren’t blocking supply or return vents. Blocked vents force your system to work harder.

Monitor for Warning Signs

Listen for odd noises, watch for uneven heating, and sniff for strange odors. These can be early signs of trouble.

Costs and Timing: What to Expect

No one likes surprise bills or endless repairs. Here’s what you should know:

• Routine Maintenance: Most annual tune-ups are quick—usually an hour or two. Costs vary based on system type and age.
• Emergency Repairs: These can take longer, especially if replacement parts are needed. Emergency hvac service is often more expensive due to after-hours labor.
• Generator Prep: Maintenance checks are usually fast, but installation is a bigger job and may take several hours.
• Preventative Steps: Simple tasks like filter changes and thermostat checks are quick and affordable, but skipping them can lead to bigger, more expensive problems down the road.

Proactive care is almost always cheaper than emergency repairs. Think of it as insurance for your comfort.

When It’s an Emergency 🚨

Sometimes, winter storms turn minor issues into full-blown emergencies. Call for emergency hvac help if you notice:

• No heat, especially during freezing temperatures
• Strange smells (burning, gas, or chemicals)
• Loud banging, screeching, or grinding noises
• Water leaks around your furnace or boiler
• Carbon monoxide alarms going off
• Electrical sparks or breaker trips

Don’t wait. These issues can be dangerous for your home and your health.

Emergency Tips: Keeping Warm and Safe

If you lose heat during a storm, here’s how to stay safe:

• Close off unused rooms to keep heat where you need it most.
• Layer up with clothing and blankets.
• Use safe, approved space heaters—never use ovens or grills indoors.
• Keep doors and windows sealed.
• Run your generator outdoors, away from windows and doors.
• Watch for signs of hypothermia or carbon monoxide poisoning.

Your safety always comes first.

Special Considerations for Businesses

Small business owners face extra challenges. Protect your investment:

• Have a backup power plan for critical equipment.
• Schedule regular HVAC and generator maintenance before the season.
• Post emergency contact numbers and procedures for staff.
• Monitor indoor air quality, especially in spaces with lots of people or sensitive equipment.
• Consider programmable thermostats to manage temperature during off-hours.

A well-prepared business weathers any storm.

FAQ: Winter Storms and Your HVAC

How often should I replace my furnace filter in winter?

During heavy use, check your filter every month. Replace or clean it at least every 1–3 months to keep air flowing smoothly.

Is it safe to use a space heater if my furnace stops working?

Yes, but only use UL-listed space heaters, keep them away from flammable items, and never leave them unattended. Never use ovens or grills for heat.

Can I cover my outdoor HVAC unit to protect it from snow?

You can use a manufacturer-approved cover, but never wrap the unit tightly or block airflow. Remove snow and ice regularly.

What should I do if I smell gas or see sparks?

Leave the building immediately, call emergency services, and then contact a certified HVAC technician. Safety first—don’t try to fix it yourself.

The Bottom Line

Winter storms can be tough, but your HVAC system doesn’t have to be the weak link. With a little preparation, you can keep your home or business warm, safe, and comfortable—no matter what the weather brings.

Call Denny's Heating now — or reach us anytime at  888-840-5783 .