Annual HVAC Maintenance Checklist for Michigan Homeowners

Most HVAC breakdowns we get called out to fix in the Grand Rapids area could have been caught with basic maintenance. Not all of them — compressors fail, parts wear out, things happen. But the majority? A loose wire that was arcing for months. A dirty flame sensor that took two minutes to clean. A filter that hadn't been changed since the Obama administration. Stuff that a tune-up or a five-minute homeowner check would have caught.

Michigan is tough on heating and cooling equipment. We have real winters, humid summers, and shoulder seasons where the temperature can't make up its mind. Your HVAC system works more hours per year here than in most of the country. Keeping it maintained isn't optional if you want it to last.

Here's what to do and when to do it, broken down by season.

Spring (March through May): Get Your AC Ready

Spring is when you shift from heating to cooling mode. Your air conditioner has been sitting idle since September, and you want to make sure it's ready before the first 85-degree day in June catches you off guard.

What you can do yourself:

• Change your furnace filter. Even if you changed it in February, start the cooling season fresh. Your filter works for both heating and cooling since all the air passes through it. Here's our full guide on how often to change your furnace filter.
• Clear the outdoor unit. Over winter, leaves, sticks, and debris pile up around your condenser. Clear everything within two feet of the unit on all sides. Gently hose off the condenser fins to remove dirt — use a garden hose, not a pressure washer.
• Check the condensate drain. Your AC produces condensation that drains through a PVC line, usually near the furnace. Make sure it's not clogged. You can pour a cup of white vinegar through the drain line to clear any buildup.
• Open all supply vents and registers. Walk through every room and make sure no vents are blocked by furniture, rugs, or closed dampers. Blocked vents create pressure imbalances that make your system work harder.
• Test the AC before you need it. On a day above 60 degrees, switch the thermostat to cooling and run it for 15 to 20 minutes. Listen for unusual noises. Check that cold air is coming from the vents. If something sounds off, you have time to schedule a repair before the summer rush.
• Check your thermostat batteries. If your thermostat uses batteries, replace them. A dead thermostat battery on the first hot day is a frustrating but avoidable problem.

What needs a professional:

• Spring AC tune-up. A technician will check refrigerant levels, test the compressor and capacitor, clean the evaporator coil, inspect electrical connections, and verify the system is cycling properly. Schedule this for April or early May. By June, every HVAC company in West Michigan is booked out.
• Refrigerant check. If your AC didn't cool well last summer, it may be low on refrigerant, which means there's a leak. Only a licensed tech should handle refrigerant. Don't let anyone just "top it off" without finding the leak — that's a temporary fix that wastes money.

Summer (June through August): Keep Things Running

Your AC is doing the heavy lifting now. Summer maintenance is mostly about not making its job harder.

What you can do yourself:

• Check the filter monthly. With the AC running daily and windows occasionally open, dust, pollen, and cottonwood fluff load up the filter fast. In the worst of July, a 1-inch filter can be done in three weeks.
• Keep the outdoor unit clear. Mow around it. Trim bushes back. Don't stack anything against it. Airflow is everything for your condenser.
• Watch for ice on refrigerant lines. If you see frost or ice forming on the copper lines going to your outdoor unit, shut the system off and call for service. Running it with a frozen coil can damage the compressor. This usually indicates low refrigerant or a dirty evaporator coil.
• Don't close vents in unused rooms. People think this saves energy. It doesn't. It creates pressure imbalances that make your system less efficient and can cause the evaporator coil to freeze. Leave all vents open.
• Check for water around the furnace. Your AC's condensate line can clog in summer, causing water to back up and pool around the indoor unit. If you see water, clear the drain line or call for service.

What needs a professional:

• Duct leakage testing. If your upstairs is always hotter than your downstairs and the system seems to be running fine, you might have duct leaks. A technician can test for leaks and seal them. This is especially common in older homes around Grand Rapids and Heritage Hill where ductwork has been modified over the decades.
• Any repair involving the compressor, capacitor, or refrigerant. These are not DIY jobs.

Fall (September through November): Furnace Prep Season

This is the most important maintenance window for Michigan homeowners. Getting your furnace ready before winter is not something you want to skip.

What you can do yourself:

• Replace the filter. New season, new filter. Every time.
• Test your furnace before you need it. On a cool evening in September or October, switch the thermostat to heat and set it a few degrees above room temperature. Let it run for 10 to 15 minutes. You might smell a slight burning odor — that's dust burning off the heat exchanger, and it's normal the first time. If the smell persists or is strong, shut it off and call a technician.
• Check all vents and registers. Same as spring — walk the house, make sure nothing is blocked.
• Inspect the flue and exhaust vents. If your furnace vents through PVC pipes to the outside, make sure the pipes aren't blocked by nests, leaves, or ice. A blocked exhaust vent is a safety issue — your furnace will shut down, and in some cases, carbon monoxide can back up into the house.
• Test your carbon monoxide detectors. Replace batteries. If your CO detectors are more than 7 years old, replace the units entirely. This is non-negotiable for any home with a gas furnace.
• Check your humidifier. If you have a whole-house humidifier, replace the water panel or pad before the heating season. Turn the humidistat to the appropriate setting (usually 35 to 40% for Michigan winters). A working humidifier makes a real difference in comfort and keeps your hardwood floors and trim from drying out and cracking.

What needs a professional:

• Fall furnace tune-up. This is the big one. A technician should inspect and clean the burners, check the heat exchanger for cracks, test the igniter and flame sensor, verify gas pressure, check the blower motor, inspect electrical connections, and test the safety controls. Schedule this for September or early October. By November, we're already getting emergency no-heat calls and availability tightens up.
• Carbon monoxide testing. A professional can test for CO leaks that a consumer-grade detector might not catch. We do this as part of every furnace maintenance visit.

Winter (December through February): Monitor and Maintain

Your furnace is working its hardest now. There's not much to do other than keep an eye on things and not ignore warning signs.

What you can do yourself:

• Change the filter every 30 days. Non-negotiable during heavy heating season. Set a recurring reminder on your phone for the first of each month.
• Keep snow and ice away from exhaust vents. After a big storm, check the PVC exhaust and intake pipes on the side of your house. If they get buried in snow or covered by ice, your furnace can't vent properly. Brush them clear. We get calls about this every year from homeowners in Hudsonville and Jenison after heavy snowfall.
• Don't crank the thermostat. If you come home to a cold house, setting the thermostat to 85 won't heat it faster. Your furnace runs at the same rate regardless of how high you set it. All you're doing is overshooting and wasting gas. Set it where you want it and let it catch up.
• Listen. If your furnace sounds different — louder, clicking, banging, or making a high-pitched noise — pay attention. New sounds mean something changed. Call before it becomes a breakdown.
• Keep return air vents unblocked. Furniture, curtains, and storage boxes end up in front of return vents all the time. Your furnace needs that return air to function. Blocking it is like running with a hand over your mouth.

What needs a professional:

• Any mid-season repairs. Strange smells (especially a rotten-egg gas smell — leave the house and call your gas company), a furnace that won't stay running, water around the unit, or a yellow/flickering burner flame all warrant a furnace repair call.
• If your CO detector goes off. Get everyone out of the house and call 911. Then call your HVAC technician. Don't re-enter until it's been checked.

Year-Round: The Stuff That Doesn't Fit a Season

Some maintenance tasks don't belong to a specific season:

• Keep records. Save receipts from filter purchases, tune-up invoices, and repair bills. This history helps your technician make better recommendations and proves maintenance for warranty claims.
• Know your equipment. Write down the brand, model number, and installation date for your furnace, AC, and water heater. Tape it to the furnace or save it in your phone. When you call for service, this information speeds everything up.
• Seal gaps around ductwork penetrations. Where ducts pass through floors and walls, gaps let conditioned air escape and unconditioned air in. A can of spray foam or some foil tape handles most of them.
• Check weather stripping on doors and windows. Your HVAC system works harder when your house leaks air. Replacing worn weather stripping is cheap and pays for itself in lower bills.

DIY vs. Pro: Where to Draw the Line

A clear rule of thumb: if it involves gas, refrigerant, or electrical panels, call a professional. Homeowners should handle filters, clearing debris, testing thermostats, and visual inspections. Leave combustion analysis, refrigerant work, electrical testing, and heat exchanger inspection to a licensed technician.

The two professional tune-ups — fall for heating, spring for cooling — are the backbone of everything else on this list. They typically cost $80 to $150 per visit and routinely catch issues that would cost $300 to $1,000+ to repair if they went undetected. It's the best return on investment in home maintenance.

We offer maintenance plans that cover both seasonal visits and give you priority scheduling during the busy months. For most homeowners in the Jenison, Hudsonville, and Grand Rapids area, that's the simplest way to stay on top of this list without having to think about it.