Heat Pump Payback in Tempe, AZ
Is a heat pump worth it in Tempe?
A heat pump earns back its extra cost in Tempe within a sensible timeframe. Against a like-for-like gas furnace and AC swap, going electric costs $3,000 more up front here. That premium is recovered through $415 of lower running costs every year, landing the payback clock at roughly 7.2 years. The window here is reasonable, and it's specific to what Tempe actually pays for power and gas.
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Tempe is one of 3206 cities covered here, each run through the same model. Search another below.
Tempe's weather, in the numbers that matter
715 heating degree days pile up here every year, so Tempe barely has a winter to speak of; the cooling side runs to 5261 cooling degree days, where summers are severe enough that cooling can dominate the annual bill. Sizing runs off the design temperature, not the average day: 36°F here (coldest 2024 reading 35.1°F), which works out to a seasonal COP of 3.27 for the standard class of unit this climate calls for. Tempe's winters don't get cold enough to need the cold-climate premium, a standard unit holds up fine. Source: NOAA station Phoenix Sky Harbor International Airpo, 5 miles from Tempe, the closest one on record.
Tempe's running-cost comparison, in dollars
Electricity use for heating alone comes out to about 554 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $784 a year. Tempe's gas rate of $18.58 per Mcf, applied to the 7 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $1,199 a year, against 15.55¢ per kWh for electricity. Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $3,225 ahead.
The break-even point in Tempe
In Tempe the cooling savings outweigh the extra electricity for heating, so no plausible change in the electricity rate would make the old furnace and AC cheaper to run. A useful quote test for Tempe: the heat pump is worth it within a decade if it costs less than $4,150 more than replacing the furnace and AC, and within 7 years if the gap is under $2,905.
The other scenario: no gas furnace to begin with
Gas isn't universal in Tempe, many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $558 a year, which recovers the extra $7,500 spent going electric in roughly 13.4 years.
Where Tempe ranks in this dataset
Tempe lands at position 2986 out of 3206 cities on heating severity (coldest is 1), and 139 out of 3206 by population size (biggest is 1). That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
What to do with this number in Tempe
Tempe, Arizona is home to about 190,114 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system, this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. Given the math above, Tempe is a place worth lining up quotes ahead of a breakdown, not waiting for one.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Tempe's 3.27 seasonal COP and payback figure. Homes in Tempe without gas service should read the electric-resistance comparison instead, the numbers there differ from the gas case above.