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Why Is My House Drafty Even With the Heat On?

If Your Home Never Feels Warm, Your Heating System Isn’t the Problem

You turn up the thermostat. The furnace kicks on. You can hear it running. But the living room still feels cold, there’s a chill near the windows, and the upstairs bedrooms never seem to warm up. You’ve already had the furnace serviced. And still, the house is just drafty.

Here’s the reality: if your furnace is running but your house isn’t warm, the problem almost certainly isn’t your furnace. It’s your home’s envelope — the walls, attic, floors, and the dozens of hidden gaps that let cold air seep in and warm air escape, no matter how hard your heating system works.


Where the Cold Air Is Actually Coming From

Most drafts in Michigan homes come from places homeowners never think to check. The top culprits in older homes include:

  • Attic hatch openings with no insulation or air barrier underneath
  • Gaps around recessed light fixtures, which open directly into your attic
  • Spaces around plumbing pipes and electrical wires where they pass through top plates
  • Rim joists — the framing at the top of your foundation — almost never insulated in pre-1990 homes
  • Gaps around window and door frames that have shifted over the years
  • Duct leaks that pull cold basement air into your living space

Your furnace is fighting all of these at once. No matter how powerful it is, it can’t keep up if the heat it generates is escaping as fast as it’s produced.


The Fix: Air Sealing and Insulation — In That Order

Proper weatherization addresses the problem in two stages. First, air sealing — using foam, caulk, and specialized materials to close every gap in your home’s thermal boundary. Second, insulation — adding the right amount of material in the right places to slow heat loss through walls and ceilings.

Homeowners who’ve been fighting drafts for years often describe the result as their home finally feeling like a real house — consistently warm, quiet, and comfortable regardless of what’s happening outside.


Michigan Programs Can Cover the Cost

If your household income falls under 150% of the Area Median Income, you may qualify for funded weatherization through Michigan’s MiHOMES program. Air sealing and insulation are exactly the kinds of measures these programs are designed to fund — and the total available support can reach $20,000 or more for qualifying homes.
Great Lakes Weatherization performs a full home energy audit to pinpoint every source of heat loss, builds the energy model required to unlock program funding, handles all paperwork, and completes all the work with our certified crews.


Book a Free Home Energy Audit

We’ll find every source of heat loss in your home and tell you exactly what programs are available to fix it.