Furnace Installation in Willmar, MN
A new furnace here will run from September through May every year. Tell us about the house, and a licensed contractor who covers Kandiyohi County will get in touch.
Tell us about the job
It takes about a minute.
Nine months of heat, down to 7 degrees
Willmar needs a working furnace from September through May. On winter nights that average 7°F, there's no coasting through a bad night on a backup space heater. The furnace has to run, and run right.
About half the homes here heat with gas, and any gas furnace installed new has to reach at least 80 percent AFUE, the federal minimum. Kandiyohi County has also logged 30 winter storms and 40 damaging wind events over the past ten years, and statewide, 13% of households lost power for a day or more in 2024. A furnace that comes back on by itself and starts reliably once the power returns matters here.
- 9 months
- September through May, your furnace is on duty
- 7°F
- the average winter night it heats against
- 50%
- of homes here heat with gas, so most furnaces here burn gas
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $110 a year to run in Kandiyohi County compared with a gas furnace.
Estimates for a typical Kandiyohi County home, from EIA household energy data, Minnesota fuel prices and NOAA climate normals. Your home will differ.
Minnesota has no state license for HVAC contractors.
There is no state license or registration behind the name on the truck. Minnesota does not test HVAC contractors or keep a record of who is qualified before they show up at your door. Anyone can call themselves a furnace installer here, so the state gives you no license number to check and no state record to fall back on if the work is bad.
What you have instead is Kandiyohi County's permit process. Most cities and counties in Minnesota require a permit for a furnace replacement, and an inspection once it's done, and that inspection is what checks the gas connection and venting, the part of this job that can hurt someone if it's wrong. Just over half the homes in Kandiyohi County heat with gas, so that inspection is doing real work here, not a formality tacked onto the job.
Source: Minnesota Office of the Revisor of Statutes
- What size furnace does my house need?
- A contractor works this out with a load calculation, not a chart based on square footage. That calculation looks at your insulation, your windows, your ceiling height, and how much air leaks in and out. A furnace that's too big will short cycle and wear out faster. One that's too small will run constantly and still leave you cold on nights near 7 degrees. Get the load calculation done rather than sizing off the furnace you're replacing, since that one may have been wrong too.
- How do I know it's time to replace my furnace?
- Watch for rising repair bills, uneven heat between rooms, and a furnace that runs longer to keep up without getting the house warm. If a repair is expensive and the furnace is old, that's a sign a replacement is close anyway. Homes here need heat from September through May, so a furnace that's struggling early in that stretch is only going to struggle more once the cold settles in. A contractor can tell you whether what's wrong is worth fixing or a sign the unit is done.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what you're replacing. Any non-weatherized gas furnace made since November 2015 already has to hit 80 percent AFUE, so the real question is whether it makes sense to go higher than that baseline. Heat is needed here from September through May, nine months of the year, so a more efficient furnace has more months to earn back the difference than it would somewhere with a shorter winter. A contractor can walk through the options and what each one means for your specific furnace and venting, since higher-efficiency models often need different venting than what's already in place.