Maintenance & Seasonal
How often should you service your HVAC?
The short answer
Service your air conditioner every spring and your furnace every fall, so each is checked right before it works hardest. A heat pump runs in both seasons, so service it twice a year. Change your filter every 1–3 months. In Minnesota, months of sub-zero furnace runtime and humid summers on the AC, this cadence isn't optional, and most manufacturers require documented annual maintenance to keep the warranty valid.
How often does each system need professional service?
The right schedule depends on what you have:
- Central air conditioner, once a year, in spring. Get it checked before the first hot stretch so it's ready when you need it.
- Furnace, once a year, in fall. A pre-winter visit covers the combustion and carbon-monoxide safety checks that matter most in a MN winter.
- Heat pump, twice a year. Because it both heats and cools, a heat pump earns a spring and a fall service.
- Ductless mini-split, once or twice a year. Clean filters regularly and have the indoor and outdoor units serviced annually (twice if it's a primary heat source). See mini-splits for additions & cabins.
Why timing it to the season matters in Minnesota
Servicing in the shoulder seasons, spring and fall, means problems surface on a mild day, not during the first 95° heat wave or the first sub-zero snap when every contractor in the metro is slammed. A furnace that won't light is far more than an inconvenience in a Minnesota January, and AC that quits in July can mean a long wait for parts. Pre-season service buys you the cheapest fix and the shortest line.
How often should you change your air filter?
Check it monthly and change it every 1–3 months. Where you land in that range depends on your home:
- Standard 1-inch filter: typically every 1–2 months.
- Pets, allergies, or a busy household: on the shorter end, monthly.
- Thick 4–5-inch media filter: often every 3–6 months (check the rating).
- Heavy heating or cooling season: check more often while the system runs daily.
A clogged filter is the most common, most preventable cause of weak airflow, a frozen AC coil, and overworked equipment, see why your AC freezes up.
What happens if you skip service?
Skipped maintenance shows up as higher energy bills (dirty coils and bad airflow make the system strain), shorter equipment life, more frequent breakdowns at the worst possible time, and, on a furnace, a real safety risk if a combustion or heat-exchanger issue goes unseen. It can also void your warranty. None of those are guaranteed, but every one of them is far more likely without a yearly check.
Does regular maintenance really protect my warranty?
Yes. Most manufacturers require documented annual maintenance as a condition of the parts warranty, if a major component fails and there's no record of service, the claim can be denied, leaving you with the full bill. Keeping a maintenance record is cheap insurance on an expensive system. See equipment warranties explained.
Our Healthy Home Club exists to make this effortless, seasonal tune-ups scheduled for you, with the paperwork kept on file.
How Gray Duct does it
We service the equipment we install, Heil, Goodman, and AprilAire, and keep your maintenance on record so your warranty stays intact. As a licensed, in-house Twin Cities team, we'll set a sensible seasonal schedule for your specific system rather than selling you visits you don't need.
- Seasonal scheduling matched to your equipment
- Maintenance documented to protect your warranty
- Licensed, bonded & insured in Minnesota
- Veteran-owned, in-house team, no subcontractors
Frequently asked questions
- Can I do my own HVAC maintenance?
- You should handle the basics, change the filter on schedule, keep the outdoor condenser clear, and watch for warning signs. But the safety, electrical, refrigerant, and combustion checks need a licensed technician with the right instruments, so pair your DIY upkeep with a yearly professional visit.
- Is twice-a-year service overkill for a furnace and AC?
- Not if you have a heat pump (it runs in both seasons). For a separate furnace and AC, once a year each is the standard, but timed to opposite seasons, that naturally works out to a spring and a fall visit.
- I missed a year, is it too late?
- No. Book a service now; the technician will catch anything that drifted and get you back on a seasonal schedule. The sooner the better, especially heading into a Minnesota winter.
Keep learning
Related & next steps
Get on a seasonal schedule
Tell us what systems you have and we'll set the right cadence, AC in spring, furnace in fall, heat pumps twice a year, and keep your warranty paperwork on file. See where we work.