Furnace Installation in Milwaukee, WI
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Milwaukee County will get in touch.
Tell us about the job
It takes about a minute.
Eight months of heat, down to 18 degrees
Milwaukee County homes need heat from October through May. That is eight months a year the furnace is the thing standing between the house and a winter night that averages 18°F. A new furnace here has to hold up through a long season, not just a few cold snaps.
Most homes in the county heat with gas, and any non-weatherized gas furnace built since November 2015 has to hit at least 80 percent AFUE by federal rule. That is the floor, not a feature, so it is worth asking what a contractor is installing above it. Power loss is also worth planning around. Wisconsin logged 18% of households going at least 24 hours without power in 2024, and the county has recorded 21 winter storms and 71 damaging wind events over the past ten years.
- 8 months
- October through May, your furnace is on duty
- 18°F
- the average winter night it heats against
- 77%
- 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 $90 a year to run in Milwaukee County compared with a gas furnace.
Estimates for a typical Milwaukee County home, from EIA household energy data, Wisconsin fuel prices and NOAA climate normals. Your home will differ.
Wisconsin requires contractors to register with the state.
That registration puts the business on file with the state so there is a record of who they are, but nobody tested their gas or furnace work to get it. Wisconsin also keeps counties and cities from layering on their own HVAC license, so that state record is the only one that exists anywhere in Milwaukee County.
What actually stands over a furnace installation here is the permit. Most cities and counties, Milwaukee County included, require a permit from the local building office for a furnace swap, and an inspector checks the work once it's done. With most homes in the county heating with gas, that inspection is what catches a bad gas connection or venting mistake, not the state registration.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- What size furnace does my house need?
- There's no single number that works for every house. It depends on your square footage, how well the house is insulated, your ceiling height, your window count, and how the place is laid out. A furnace that's too big cycles on and off too fast and never runs long enough to heat evenly. One that's too small runs constantly and still can't keep up on a night near 18 degrees, which is a normal winter low here. A contractor will do a load calculation on your specific house rather than go by a rule of thumb, and that's the only way to get the size right.
- How do I know it's time to replace my furnace?
- Watch for rooms that won't heat evenly, a furnace that runs longer than it used to, or repairs that keep coming back. An older furnace that struggles in October or in May usually won't make it through the full stretch to a winter low of 18 degrees without more trouble. Heat is needed here from October through May, eight months of the year, so a furnace that can't keep up in the mild months is a bad sign for what's ahead. If yours is old and starting to act up, it's worth having a contractor look at it before the cold sets in for good.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what you're replacing. Every new non-weatherized gas furnace sold today has to reach at least 80 percent AFUE by law, so even a standard-efficiency model wastes less fuel than an old one might. A high-efficiency furnace sends less heat out the flue and more into your house, and with heat running here eight months out of the year, that difference shows up more than it would somewhere with a short winter. A contractor can walk you through the options for your house and price out what each one would mean for the installation.