Furnaces and Cooling Systems in Southeast Michigan Homes: What Inspectors Check Before the Temperature Swings

Southeast Michigan asks a lot of a home's heating and cooling system. Furnaces run hard from October through April, and central air units get pushed through humid, 90-degree stretches in July. Few systems in the country see this kind of seasonal swing, and that stress shows up during inspections in Wayne, Oakland, and Macomb counties every week.

An HVAC system doesn't have to be brand new to be sound, but it does need to be safe, properly maintained, and matched to the home it's serving. Here's what we're actually looking at when we evaluate a furnace or cooling system during a pre-purchase or pre-listing inspection.

Furnace Age and Condition

Many homes across Detroit's older neighborhoods still have furnaces original to a previous remodel, sometimes 15-20+ years old. Age alone isn't a defect, but it raises the odds of cracked heat exchangers, failing igniters, or corroded flue connections. We check the unit's data plate, look for rust or scorching around the burner compartment, and inspect the venting for proper slope and connection.

Signs We Look For

• Soot or discoloration around the burners or cabinet
• Unusual noises during cycling, which can point to blower or motor issues
• Cracked or disconnected flue piping, a carbon monoxide concern
• Dirty or missing filters, which strain the whole system
• Mismatched thermostat wiring from DIY updates

Central Air and Cooling Components

Central air isn't universal in older Detroit-area homes, especially in city neighborhoods where window units are still common, but where it exists, we check the outdoor condenser for physical damage, refrigerant line insulation, and clearance from siding, decks, or overgrown landscaping. Indoors, we look at the evaporator coil area for signs of past leaks or rust, and we test operation when weather conditions allow.

Common Cooling Issues in the Region

• Condensers set too close to fences or shrubs, restricting airflow
• Rusted or bent fins from years of lawn debris and mowers
• Condensate lines draining improperly, sometimes right onto a foundation
• Undersized systems added after an addition or finished basement

Ductwork and Distribution

A furnace can be in great shape and still leave rooms uncomfortable if the ductwork isn't doing its job. In many older Metro Detroit homes, especially those with additions or converted attics, we find disconnected runs, crushed flex duct, or supply lines that were never balanced for the added square footage. We check accessible ductwork in basements, crawlspaces, and attics for insulation, sealing, and obvious damage.

Why This Matters for Buyers and Sellers

A failing furnace heading into a Michigan winter, or a dead AC unit in August, is one of the most disruptive surprises a new homeowner can face. For sellers, a documented, functioning system with a clear service history can be a real advantage during negotiations. For buyers, understanding the system's age, condition, and any red flags helps set realistic expectations for near-term costs.

Our inspectors evaluate furnaces and cooling systems as part of every residential inspection across Wayne, Oakland, and Macomb counties, checking safety, function, and signs of deferred maintenance so you know exactly what you're working with before the next season arrives.

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