HVAC Repair in Warren, MI
Homes here need heat from October through May and cooling from June through August. If your system quits, tell us what it's doing and a licensed contractor who covers Macomb County will get in touch.
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Eight months of heat, three of cooling, and not much rest between
Your furnace in Warren works most of the year, October through May, and on the coldest nights it is cycling on and off for hours to hold the house against a 21°F average low. Every start puts load on the igniter and the flame sensor. Come June the same system switches over and runs the compressor through summer afternoons that average 81°F. Eleven months of the year, something in that system is running.
Most homes here heat with gas, so when the furnace won't fire, there is no backup burning to fall back on. Macomb County has also seen 16 winter storms and 99 damaging wind events over the past ten years, and across Michigan, over a third of households lost power for at least a day in 2024. A furnace or air conditioner that was already struggling often does not come back cleanly once the power does.
- 8 months
- October through May, your system heats
- 3 months
- June through August, it cools
- 21°F
- the average winter night it heats against
- 81°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
A new furnace and air conditioner would cut about $160 a year off heating and cooling for a typical Macomb County home.
Estimates for a typical Macomb County home, compared with an older unit built to the previous federal minimum, from EIA household energy data, Michigan fuel prices and NOAA climate normals. Your home will differ.
Repair makes sense when one part has failed.
Replacement makes sense when the furnace's heat exchanger is cracked, the air conditioner's compressor has failed, or repairs keep coming.
Michigan requires HVAC contractors to hold a state license.
Michigan licenses HVAC contractors through the Board of Mechanical Rules. That license belongs to the contractor, not to any single job, so the same license covers the repair happening in your house and every other job that contractor takes on.
For a heating and cooling repair, the license is what stands behind the person doing the work. It tells you the state has this contractor on record. It does not mean someone from the state is checking this particular repair.
Sources: Michigan Legislature · Michigan Department of Licensing and Regulatory Affairs
- Why is my heat not working?
- Start with the thermostat. Check that it's set to heat, not just a temperature you'd like, and that the batteries aren't dead if it uses them. If the thermostat looks right, check your breaker panel and any gas shutoff valve near the furnace, since a tripped breaker or closed valve will stop it cold. Most gas furnaces won't fire if the pilot or igniter fails, and that's a job for a contractor to diagnose. With 88% of homes here heating with gas, a furnace that won't start is often either a power problem, a gas supply problem, or a part that's worn out and needs a licensed contractor to replace.
- Why is my system running but not cooling the house?
- If the blower is running but the air isn't cold, check your air filter first. A filter clogged with dust chokes the airflow across the coil and can freeze it up, so the system runs without actually cooling. Next check outside at the condenser unit and make sure nothing, like leaves or grass clippings, is blocking the coil. If the filter is clean and the outdoor unit is clear, the system may be low on refrigerant or have a coil problem, and that needs a licensed contractor to find and fix.
- What can I check before calling for HVAC repair?
- Check the thermostat settings, the batteries in it, and the breaker or fuse for the system. Check that your air filter isn't clogged, since that alone causes a lot of no-cool and weak-airflow calls. Look at the outdoor unit if you have one and clear away anything blocking it. If your home lost power recently, some systems need to be switched back on at the unit itself. If everything checks out and the problem is still there, a licensed contractor will need to look at the parts inside the unit.