All-Electric Home Conversion in the Phoenix Metro

Phoenix is the easy case for going electric

Most of the country argues about whether a heat pump can carry a house through winter. Chandler in January does not qualify as an argument. Nights dip into the forties, a few mornings flirt with frost, and by ten the sun is back on the stucco. A correctly sized heat pump handles that load without effort, using the same outdoor unit that has to survive July. In most Valley homes the air conditioner is already half a heat pump. Conversion mostly means finishing the job.

Consider what the gas furnace does here. Its blower runs all summer moving cold air; its burners run a few hundred hours a year. You pay a gas utility's service fee twelve months a year for a heating season you could measure in weeks. That math is the real case for an all-electric home, and it is also why the honest answer is sometimes to wait. If the furnace is young and the air conditioner is not, read the repair-or-replace guide first.

What changes the scope

Two houses on the same Gilbert street can need very different projects.

• The electrical panel. A 1978 block-and-stucco ranch on a 100-amp panel was wired for a gas furnace, gas water heater and gas range. Add a heat pump with electric backup strips, a heat pump water heater and an induction cooktop, and the panel may run out of room, out of amps, or both. A load calculation by a licensed electrician settles it. Sometimes that means a new panel and service upgrade. Sometimes a load-management device lets the existing panel stay.
• Backup heat. Heat pumps in Phoenix rarely need much supplemental heat, but the electric strips still have to be sized, wired and breakered. Fewer kilowatts of backup means a smaller circuit.
• Split system or rooftop package. A gas-electric package unit on the roof becomes a package heat pump: crane, curb adapter, capped gas line, new electrical whip. A split system swaps the furnace for an air handler and the condenser outside. Our rooftop unit replacement page covers crane day.
• Ductwork. A heat pump delivers warm air, not hot air, and moves more of it. Undersized returns and leaky attic runs show up as rooms that never quite get there. Duct sealing and a return-air upgrade belong in the scope, not the afterthought column.
• The rest of the gas. Capping the line at the furnace is simple. Dropping gas service entirely only makes sense once the water heater, range and dryer are also electric. Until then, the fixed monthly fee stays.

The water heater is the second domino

A heat pump water heater pulls heat out of the surrounding air and puts it into the tank. In a Phoenix garage, where the air is hot most of the year, that is a happy arrangement: the tank gets free heat and the garage gets slightly cooler. It needs a dedicated circuit and a condensate drain, so plan for it during the electrical work rather than after.

Utility considerations

Whether you are on APS or SRP, the rate plan matters as much as the equipment. Time-of-use rates reward a system that runs long and low and punish one that lurches on at six in the evening. Demand-based plans go further and bill the single worst half hour of the month. A variable-speed heat pump behaves well under those rules. A single-stage unit with backup strips that fire on a cold January morning does not. Our page on single-stage, two-stage and variable-speed equipment explains why.

Summer, not winter, is the real utility question in the Valley. If you have never studied your rate plan, a conversion is the moment to do it.

Sequencing the project

• First, the load calculation and electrical assessment. Before anyone quotes equipment, someone needs to measure the house and the panel.
• Second, the envelope. Attic insulation, duct sealing and shading west-facing glass shrink the load. A smaller load means a smaller heat pump, smaller strips and a smaller electrical ask.
• Third, panel work if it is needed. Coordinate with the utility early. Service upgrades run on the utility's calendar, not yours.
• Fourth, the heat pump. Ideally in fall or spring, when a day without cooling is an inconvenience rather than a hazard.
• Fifth, the water heater and other appliances. Then decide whether to keep gas service at all.

Federal, state and utility incentives for heat pumps and heat pump water heaters exist, and some depend on doing the steps in a certain order with certain documentation. Our rebates page tracks the programs that apply in the Phoenix metro, and estimates and financing explains how a written scope and financing on approved credit fit together.

Questions to ask any bidder

• Did you perform a room-by-room load calculation, or did you match the existing tonnage?
• How many kilowatts of backup heat are you proposing, and why that number?
• Who is doing the electrical load calculation, and is a panel upgrade included, excluded or unknown?
• Is duct sealing or a return-air upgrade in this scope? If not, why not?
• What happens to the gas line, and who caps it?
• Is the bid a flat, written price with the scope spelled out before work begins?

When to leave the furnace alone

A conversion is a poor idea when the furnace and condenser are both under ten years old and running well, when a required panel upgrade is beyond reach and load management is not an option, or when the house is a rental you plan to sell before the savings catch up. A fall heating tune-up costs little, and a maintained furnace will wait patiently for the day the air conditioner forces the decision.

None of this can be settled from a web page. A page cannot count amps at your panel or measure static pressure in your ducts. The next step is an on-site evaluation, a written scope, and a flat-rate number before anyone touches a wire.