The furnace kicks on at 6 a.m. and runs for twenty minutes. Then again at 6:30. Then 7. The thermostat reads 68 degrees, but the bedroom is cold and the bill at the end of the month is not. If you own or rent an older home in Detroit, you probably know this pattern. The house feels like it's fighting you.
It is. Here's why, and what can be done about it without spending money you don't have.
The bill isn't a mystery — it's physics
Heat moves from warm to cold. That's not a flaw in your house; that's thermodynamics. What determines how fast it moves is the thermal resistance of the materials between inside and outside. In a well-insulated, air-sealed home, heat moves slowly. In an older home with thin walls, no vapor barrier, and gaps around every pipe penetration and wire run, it moves continuously and fast.
Your furnace isn't malfunctioning when it runs that often. It's compensating for a house that was never designed to hold heat. Michigan's first statewide residential energy code addressing thermal performance came decades after most of Detroit's housing stock was built. The houses weren't built wrong for their era — they were built to standards that didn't yet exist.
What "pre-1960 construction" actually means in Detroit
Detroit's housing stock is among the oldest-concentrated in the country. Amanda Nothaft, Director of Data and Analysis at Poverty Solutions at the University of Michigan, found that 88% of Detroit seniors live in homes built before 1960, compared with 34% of seniors elsewhere in the state. (Source: The Conversation, January 13, 2026.) That concentration shapes almost everything about energy costs in this city.
Age alone doesn't explain the problem — the specific construction practices do. Homes from this era were built without insulated wall cavities as a code requirement, without house wraps or continuous air barriers, and without the diagnostic tools to measure what they were losing. Building science as a professional field barely existed then. The result is a city where the housing itself is a structural driver of utility costs, independent of rates.
The U.S. Energy Information Administration found that homes built in the 2000s use 21% less energy for space heating on average than older homes, primarily because of better building shells and equipment meeting energy codes. (Source: U.S. Energy Information Administration, 2013, based on 2009 RECS data.) For a home built in 1950 with its original insulation and no air sealing work done, the gap is larger than that average captures.
This is worth saying plainly: the problem isn't how you use energy. It's what your house is made of and how it was built.
The four physical mechanisms driving up the bill
Air infiltration is usually the biggest one, and the least visible. Gaps around pipes, wires, electrical boxes, and framing connections let conditioned air escape and pull outside air in continuously. The air doesn't wait for you to open a door. It moves through every unsealed penetration, all day and night, regardless of how the thermostat is set.
Conduction through under-insulated walls and attics. Wall cavities in pre-1960 Detroit homes are commonly uninsulated or have insulation that has settled and compressed over decades. Heat conducts through wood, masonry, and the gaps between them. What looks like a solid wall is often a minimal thermal barrier.
Attic bypass. Heat rises, and an attic with inadequate insulation continuously pulls warm air upward. Gaps around light fixtures, plumbing chases, and attic hatches create pathways that insulation sitting above them can't stop. Air sealing the attic floor before adding insulation is the sequence building-science professionals consistently recommend — the insulation alone can't do the job if conditioned air is bypassing it through those gaps.
Outdated heating equipment. This one matters, but it's not the first problem to fix. Older furnaces operate at meaningfully lower efficiency than modern condensing units, meaning a higher share of each energy dollar goes up the flue rather than into the living space. But replacing a furnace in a leaky house doesn't fix the leaky house — it just puts a more efficient machine in an inefficient shell.
Why the furnace running more is a symptom, not the cause
Homeowners often focus on the furnace because it's the visible equipment and the logical place to look. But if the building envelope is losing conditioned air faster than the furnace can replace it, equipment changes alone don't close the gap. You'd be sizing a machine to fit a problem that has a different solution.
This is why building performance professionals talk about envelope first, equipment second. Fix the shell. Then right-size the heating system for a house that actually holds heat. Doing it in the wrong order means paying for equipment sized to a leaky house that no longer exists after the air sealing work is done.
A blower door test makes the air infiltration problem measurable rather than theoretical. The test pressurizes the house and quantifies air movement in air changes per hour at 50 pascals (ACH50). A pre-1960 Detroit home routinely tests at ACH50 levels far above what current Michigan energy codes require for new construction. The gap isn't a guess. It's a number, and it points directly to where the work should happen.
What a whole-home assessment finds that a visual inspection misses
Looking at your attic and walls won't tell you where the heat is leaving. A trained Building Analyst uses diagnostic tools that make the invisible measurable.
Thermal imaging under blower door pressure shows exactly where insulation is missing or failing — not approximately, but room by room and gap by gap. Combustion safety testing checks that gas appliances aren't backdrafting carbon monoxide into the living space. This step matters because tightening a home's envelope without checking combustion safety can create a hazard. The sequence — assess first, then work — exists for safety reasons, not procedural ones.
The output of a proper assessment isn't "add insulation everywhere." It's a prioritized finding list: these specific attic bypasses and these joist bays are where the most heat is leaving; address them in this order for the highest return.
Through our ICAN Workforce Development program, in partnership with Michigan EGLE, we certified 20 Detroit-area residents as BPI Building Analysts — both BA-T (technical diagnostic) and BA-P (professional) credentials. These are the qualifications that allow a Building Analyst to perform this diagnostic work to a national standard. The people doing this work know Detroit's housing, because they live in it.
What "up to 50% lower energy bills" actually requires
The figure is real, but it has conditions. A reduction of up to 50% applies to homes that start in poor condition and receive comprehensive work: air sealing plus insulation plus equipment, completed in the right sequence.
A home that receives attic insulation without air sealing first gets partial benefit. The air bypasses the insulation through gaps the batts can't address. Comprehensive whole-home retrofits outperform partial fixes because they treat the mechanisms together. Fixing one without the others leaves the remaining losses in place.
For a Detroit household, the difference between a partial fix and a whole-home retrofit is the difference between a modest monthly reduction and a structural change to what the house costs to operate every month of the year. That changes the household budget in a lasting way, not just for one season.
What WWGT's Whole Homes, Whole Communities program covers — and what it costs homeowners
Our Whole Homes, Whole Communities (WHWC) program is a four-year initiative serving Highland Park and East Detroit. The $8 million in funding was secured through a settlement in a DTE case. That money is now going back into these neighborhoods as free home repairs, clean energy improvements, and homeowner education.
Free means free. Homeowners in the program pay nothing for the assessment or any of the work. Insulation, air sealing, equipment upgrades, health and safety repairs — all covered through program funding.
Homeowner education is part of every engagement. Understanding what was done and why is what makes the savings hold. A household that knows how its home now works is better positioned to maintain those gains.
The Healthy Home Production program addresses the health dimension of the same housing conditions. Indoor pollutants, ventilation, and the intersection of building envelope problems with indoor air quality are connected issues — tightening a home changes what's inside it, and both need attention together.
How to find out if your home qualifies
Program capacity is limited. WHWC moves through neighborhoods systematically over the four-year timeline, so whether your address is currently in the active service area depends on where the program stands at this moment.
The starting point is contacting us directly. We can tell you where enrollment stands and whether your address falls within the current service area. If you're in Highland Park or East Detroit and own your home, it's worth the call.
If you're outside the WHWC service area, Michigan's Weatherization Assistance Program (WAP) provides free weatherization for income-qualifying households through local community action agencies. It uses the same building-science approach — blower door, combustion safety, prioritized retrofits — with different geographic coverage.
Check whether your home qualifies — contact WWGT
Learn more about the Whole Homes, Whole Communities program
Frequently Asked Questions
How much more does it cost to heat an old house compared to a new one?
Nationally, homes built in the 2000s use 21% less energy for space heating on average than older homes, according to the U.S. Energy Information Administration (based on 2009 RECS data). That's the average across the country's older housing stock. For a home built in 1950 with its original insulation and no air sealing work done, the gap is typically larger. The specific difference depends on the home's starting condition, but the mechanism is consistent: older construction lacks the insulation levels, air barriers, and equipment efficiency that current energy codes require.
Does insulation actually lower your heating bill?
Yes — but how much depends on what else is done alongside it. Insulation reduces heat conduction through walls and attics, but air infiltration bypasses insulation through gaps. A home that receives insulation without air sealing gets partial benefit. Comprehensive whole-home work — air sealing plus insulation, in the right sequence — delivers the largest and most lasting reductions. That's why WWGT's program covers both, not one or the other.
What is the biggest source of heat loss in an older home?
Air infiltration is typically the highest-impact source and the most invisible to homeowners. Gaps around pipes, wires, electrical boxes, and framing connections let conditioned air escape and draw outside air in continuously. Attic bypasses — gaps around light fixtures, plumbing chases, and attic hatches — are among the most significant and least visible heat loss pathways in older homes. A blower door test makes the actual infiltration rate measurable. The result is a specific number, not an approximation, and it directs the repair sequence.
This article connects to related reading in the cluster: Why Are Detroit Energy Bills So High covers the financial and energy-justice dimensions of Detroit's utility costs. What Happens During a Home Energy Audit in Detroit walks through the assessment process step by step. Detroit Home Weatherization: What's Covered and How to Qualify covers eligibility mechanics across available programs. What's in the Air Inside Detroit's Older Homes addresses the indoor air quality dimension of the same housing conditions. [cluster links confirmed=false — these posts are not yet published]
We Want Green Too is a Detroit-based 501(c)(3) nonprofit, EIN 45-5324148, founded in 2007 by Gloria J. Lowe. We work on energy-efficient, healthy housing and green-economy careers for Detroit residents and veterans. Visit us at wewantgreentoo.com.
