Heat pump or propane? In Dewey-Humboldt, the answer is often both.

What dual fuel actually means

A dual-fuel system pairs an electric heat pump with a gas or propane furnace. They share the same ductwork and thermostat. The heat pump heats the house in mild weather and cools it in summer. When it gets cold enough that the heat pump struggles, the system switches to the furnace.

The temperature where it switches is called the changeover point, and it's set during installation. Getting that setting right matters more than almost anything else on the job.

Why it fits this area

Dewey-Humboldt sits in the 4,500-foot range, where winter days are often mild and nights drop below freezing. That's a good match for dual fuel. A heat pump handles cool days efficiently, and the propane furnace covers cold nights, when a heat pump alone would lean on expensive electric strip heat.

Altitude matters too. Thinner air means an outdoor coil and a furnace both work a little differently than they would at sea level. Equipment should be sized and set up for the elevation, not straight from a chart made for Phoenix. We covered the heat pump side in more detail in our post on Prescott heat pump winter bills.

When it pays off, and when it doesn't

Dual fuel tends to make sense when:

• Your propane furnace is aging and your AC is due at the same time, so you're replacing both anyway.
• You're paying for large propane deliveries every winter.
• The home already has decent ductwork that can handle heat pump airflow.

It makes less sense when the furnace is fairly new and only the AC has failed. In that case, replacing the AC with a heat pump and wiring it to the existing furnace can get you most of the benefit for less money, if the furnace is compatible. We'll tell you plainly which case you're in.

Freeze and defrost: what's normal

In winter a heat pump's outdoor unit collects frost, then runs a short defrost cycle. You might see steam coming off it, and the fan stops for a few minutes. That's normal. What isn't normal is a unit encased in solid ice, or one that sits in a spot where snowmelt drips onto it from the roof. It should be raised off the ground and kept clear of roof runoff.

Lightning and surge protection

Summer storms in this part of Yavapai County are hard on electronics, and a modern variable-speed heat pump has a control board worth protecting. A surge protector at the disconnect doesn't cost much next to a board or compressor. It's worth adding when the system goes in.

What to ask before you replace

1. What changeover temperature will you set, and why?
2. Has the system been sized with a load calculation for this house and this elevation?
3. Can the existing ductwork carry heat pump airflow, or does it need work?
4. What refrigerant does the new equipment use? New systems are moving to R-454B.

We quote every replacement in three tiers side by side, and 0% APR financing is available on approved credit. We serve Dewey-Humboldt along with Prescott Valley and the rest of the Quad Cities, and we schedule set days in the area. Call (928) 565-6440 to get on the list.