Surprise, AZ: the heat pump payback math
The math in Surprise isn't close — a heat pump wins outright. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $1,000 after a $2,000 federal tax credit. Surprise's residents would see roughly $407 a year back in running costs, putting the payback around 2.5 years. That verdict holds specifically for Surprise's own climate and rates, not a national average.
Surprise's weather, in the numbers that matter
1050 heating degree days pile up here every year, so Surprise barely has a winter to speak of; the cooling side runs to 4871 cooling degree days, where summers are severe enough that cooling can dominate the annual bill. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 31.6°F, against a record low of 31.5°F. That puts the seasonal coefficient of performance at 3.14 for the recommended standard unit. Surprise's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. These numbers come from LUKE AFB AIRPORT, the closest NOAA station, 9.7 miles out.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 847 heating kilowatt-hours annually on top of cooling, totalling about $777 a year on electricity. Surprise's gas rate of 18.58 per Mcf, applied to the 11 Mcf a year the furnace burns, puts its running cost near $1,185 a year, against 15.55¢ per kWh for electricity. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 27 years, for a 15-year net position $5,110 ahead.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Surprise — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Surprise's answer improves. About $618 a year comes back this way, enough that the 8.9-year payback clears the $5,500 premium comfortably within the equipment's life.
Where Surprise ranks in this dataset
Ranked against the other 3206 cities covered, Surprise comes in at 2877 for heating severity — 1 would be the coldest place in the dataset — and 159 by population, where 1 is largest. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Surprise, AZ
Surprise, Arizona is home to about 167,564 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, Surprise is a place worth lining up quotes ahead of a breakdown, not waiting for one.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
Every constant behind this page — the 3.14 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. The $2,000 federal credit baked into Surprise's number is explained, with the before-and-after math, in the tax credit guide.