Q&A: Working Around Electrical Panel Limits in Heat Pump Retrofits

If you have an old home with a small electrical panel, you might assume a heat pump means an expensive panel upgrade first. A recent industry Q&A with a Midea product specialist suggests that's often not the case anymore. Newer inverter-driven heat pumps, which adjust their output up and down rather than switching fully on and off, can draw about the same amount of power as the air conditioner or furnace they're replacing. In one comparison, a Midea cold-climate heat pump needed the same maximum breaker size as several standard air conditioners.

There are also installation approaches that avoid electrical work altogether. In milder climates, some heat pump and air handler setups can run off an existing 115-volt furnace circuit with no backup heat added. Another option is "dual fuel," where a homeowner keeps their gas furnace as backup while a heat pump handles most of the heating and cooling load. The main exception is homes with older fuse-based panels (rather than modern circuit breakers), which may need an upgrade no matter what heating system goes in.

The specialist also expects heat pump water heaters to matter more here, since swapping out a standard electric water heater is one of the fastest ways to cut a home's electrical load. As more households add things like EV chargers, panel capacity will keep coming up — but the takeaway is that fewer homes than expected may actually need a full electrical upgrade to add a heat pump.