Don't Get Left Out in the Heat: Air Conditioner Basics

The first 90 degree day always exposes the weak link in a home. You walk to the thermostat, drop it to 72, and an hour later it still reads 78. The unit is running. It just isn't winning. In this episode of Thoughts from the Crawl Space, Jamie Miller breaks down how residential air conditioning actually works and how to make sure that frustrating scenario isn't yours this summer.

The big idea is simpler than most people expect: an air conditioner does not make cold air, it moves heat out of your house. From split systems and mini splits to geothermal heat pumps, Jamie explains the parts that do the work, why an oversized unit can actually hurt you by skipping dehumidification, and what a home inspector looks for on every cooling system, including the data plate, tonnage, temperature split, clearance, refrigerant lines, electrical disconnect, and condensate drain.

You'll also learn the warning signs that your unit is in trouble, the repair-or-replace math behind older R22 systems, and a practical six-step action list to keep your AC running efficiently. Whether you're buying a home this summer or protecting the one you already own, the age and condition of the air conditioner is something worth understanding before the heat arrives.

● An air conditioner doesn't create cold air, it moves heat out of the house. The refrigerant absorbs heat inside and releases it outside, which is why warm air blows off the outdoor unit while it runs.

● Most Indiana homes use a split system, with the condenser outside and the evaporator coil, or A-coil, inside on or near the furnace. Mini splits and geothermal heat pumps are other options for cooling and heating.

● A bigger unit is not better. Oversized systems cool fast, shut off, and never run long enough to dehumidify, leaving the home clammy and wearing out the compressor with constant on-off cycling. A slightly undersized unit that runs longer is healthier.

● Inspectors read the data plate for age and capacity. In the model number, find the value roughly divisible by 12 and divide by 12 to get tonnage. One ton cools roughly 800 to 1,000 square feet.

● A proper temperature split between return and supply air runs about 14 to 22 degrees, with 15 to 20 ideal. Too little can mean low refrigerant, too much can point to a dirty, slow blower motor.

● Keep at least a couple of feet of clearance around the outdoor unit so it can breathe. The larger suction refrigerant line should be insulated end to end to prevent sweating, dripping, and damage.

● Every system needs an outdoor electrical disconnect within sight, usually no more than six feet away, so a technician has full control of the power. Keep the condensate drain clear, or backed-up water will pool or shut the unit down.

● Warning signs include constant running without reaching temperature, weak or warm air at the vents, ice on the refrigerant line, water around the furnace, new grinding or rattling noises, short cycling, and a sudden spike in the electric bill.

● Older R22 systems are expensive to recharge since the refrigerant was phased out, so a major leak often makes replacement smarter. Most units last 15 to 20 years, longer with good maintenance.

● Gold Key Inspection Services: https://www.goldkeyinspection.com

● Gold Key Inspection Services phone: 260-463-6558

Connect

● Podcast, Thoughts from the Crawl Space: https://www.goldkeyinspection.com/podcast

● Gold Key Inspection Services: https://www.goldkeyinspection.com

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