Utility Rates Rose Again, and Your Thermostat Is Not the Answer

Another round of rate increases came through this year, and with them another round of ads promising a smart thermostat will save you thirty percent. It won't. In a home with a decent schedule already set, a smart thermostat saves single digits. It's a nice product. It is not a savings plan.

Here's the ranking as we actually see it in valley homes, biggest lever first.

One: duct leakage. In the older stock around here — the fifties and sixties ranch houses especially — we regularly find twenty to thirty percent of conditioned air dumping into a crawlspace or attic. You are paying to heat dirt. Sealing and insulating accessible duct runs is unglamorous, costs a fraction of a system replacement, and pays back faster than anything else on this list.

Two: system sizing. An oversized air conditioner short-cycles, never runs long enough to dehumidify, wears its compressor out early, and costs more to buy. A shocking number of the systems we replace were oversized by a full ton or more, because somebody eyeballed the square footage instead of running a load calculation. We run Manual J on every install and I'd tell you to hire anyone else who does, over anyone who doesn't.

Three: attic insulation. Not our trade, and I'll still bring it up in your living room, because putting a new system into an under-insulated house is like buying a bigger engine to fix a hole in the gas tank.

Four: equipment efficiency. Real, meaningful, and fourth on the list. A jump from a fifteen-year-old 10 SEER unit to a modern high-efficiency system is a genuine cut in summer cost. But it lands better on a sealed, right-sized, well-insulated house, and the same money spent on items one through three often returns more.

Five: the thermostat.

I'm aware I just spent five paragraphs steering people away from the most profitable thing I sell. That's on purpose. The measure of whether you can trust an HVAC contractor is whether they'll tell you when the answer isn't a new HVAC system.