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What is a flame sensor, and why does cleaning it fix my furnace? A flame sensor is a thin metal rod that sits in your furnace’s burner flame and proves to the control board that the fire actually lit. Over a season it builds up a coating that weakens its signal, so the furnace lights, […]
What is an air handler, and do I have one? An air handler is the indoor blower unit for a heating and cooling system that doesn’t burn fuel — it contains a blower, an evaporator coil, and usually electric heat strips. Here’s the short version of whether you have one: if you have a gas […]
Do my furnace and air conditioner use the same system? Yes, and it might be the single most useful thing a homeowner can understand about their HVAC, because it explains four decisions you will eventually have to make: diagnosis, maintenance, prevention, and replacement. You do not have two machines. You have one system with two […]
Do I really need a furnace tune-up every fall? Honest answer: your furnace will probably work without one. But “works” and “checked” are two different things, and a tune-up is how you find out which one you have before the first cold night in November. Here is what you are actually paying for. Schedule your […]
When should you turn your furnace on? Not when it gets cold. Three years of our own no-heat call data says the rush starts the same two weeks every October.
A verified crack is dangerous — it can put carbon monoxide in your air. But “verified” is the key word. Here’s why they crack, the photo trick some companies use, and the four things to demand before you believe a diagnosis.
By Jacob | Schraer Heating & Air Conditioning · Last reviewed: September 2026 Why is my AC running but not cooling the house? The most common causes are restricted airflow (usually a clogged filter), a dirty outdoor condenser coil, low refrigerant from a leak, a frozen evaporator coil, or an outdoor unit that’s running its […]
By Jacob, Owner, Schraer Heating & Air Conditioning Compare cost per year, not sticker price. Divide the repair quote by the number of years that repair will actually buy you. Then divide the cost of a new system by how long it should last, and subtract what you’d save on energy bills. The lower number […]
Your ductwork plays a crucial role in keeping your Missouri home comfortable throughout the year.
When certain areas of your home never seem to stay comfortable, it may be time to consider a smarter cooling solution.
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