Cold mornings, warm afternoons: heating and cooling through Chino Valley's daily swings.

Why the swings are so big here

Chino Valley sits on open high desert at around 4,700 feet. Dry air and clear skies let the ground give up its heat fast after sundown, so nights get cold even after a warm day. In fall and spring it's common to wake up to frost and see the afternoon climb into the 70s. Homes on open lots with little shade feel it even more, because the afternoon sun hits the walls and windows directly with nothing to break it up.

For your heating and cooling, that means the system may be asked to do two opposite jobs in the same day, sometimes for weeks at a stretch.

Thermostat settings that help

• Be careful with “Auto” mode. Auto lets the thermostat switch between heat and cool on its own. That's handy here, but if the heat and cool setpoints are close together, the system can heat in the morning, cool in the afternoon and fight itself all day. Leave a gap of several degrees between them.
• Use a schedule, but don't overdo the setback. Turning the heat down at night or while you're away saves fuel, especially if you heat with propane. With a heat pump, though, a big setback can backfire. When the thermostat asks for a large jump in the morning, many systems bring on the electric strip heat to catch up, and that's the expensive way to heat. A thermostat built for heat pumps, with adaptive recovery, warms the house gradually instead. We covered the strip heat side in our post on heat pump winter bills.
• Let the sun help. On a cold, clear morning, open the blinds on the south and east sides and let the sun do some of the heating. Close the west-facing ones before the afternoon heat.

Short cycling on mild mornings

A furnace sized for the coldest night of the year is far bigger than what a 45-degree morning needs. It fires up, heats the house fast, shuts off a few minutes later, and repeats. That on-off cycling wears out igniters, inducer motors and other parts sooner, and it leaves rooms swinging between too warm and too cool.

When it's time to replace, a two-stage or variable-speed furnace or heat pump handles this much better. It runs at low output on mild mornings and saves full output for the cold nights. Sizing should come from a load calculation for your house, not the size of the old unit.

Heat pump or propane, or both?

Many Chino Valley homes, especially on the rural lots, heat with propane, while others use a heat pump. Big daily swings are a good fit for a dual-fuel setup: the heat pump handles cool mornings and also does the cooling in the afternoon, and the propane furnace takes over on the coldest nights. Our post on dual-fuel systems with propane backup explains how the changeover works.

Ducts in the attic or under the floor

Ducts in an attic face the same swings the house does: cold overnight, hot in the afternoon. Leaky or poorly insulated runs lose heat on winter mornings and gain heat in the summer, and the rooms at the end of the longest runs are usually the ones that never feel right. In manufactured homes, the same goes for the ducts in the belly under the floor. Sealing and insulating ducts is often one of the best-value fixes in a house with big comfort differences from room to room.

Get the heating side checked now

If your system has been switching between heat and cool all fall, it's already working through the season. A maintenance visit checks both sides: the furnace burners, heat exchanger, flame and venting, or the heat pump's defrost and backup heat, plus the thermostat setup and the filter. If you heat with propane, we also check that the furnace is set up for propane and for the elevation.

If your system is older and struggling, we can look at a furnace or heat pump replacement. We're a Trane dealer, we quote every replacement in three tiers side by side, and financing is available on approved credit. Our crew runs set days in Chino Valley, so planning a replacement ahead of the cold works better than waiting for a breakdown.

Air-Exx is veteran owned, licensed, bonded and insured (AZ ROC 350424). See our Chino Valley service page, or call (928) 565-6440 to get on the schedule.