What every install needs
Most outdoor units run on their own 240 V circuit from the panel to a disconnect beside the unit, so a technician can cut the power while working on it. A low-voltage control cable runs with the line set between the outdoor unit and the indoor equipment. If you're replacing an AC, the old circuit can often be reused once it's checked against the new unit.
When the panel comes up
- The panel is full. There's no space for a two-pole breaker. Tandem breakers or a subpanel can sometimes solve it.
- The panel is small. Older 100 A services can run short once a heat pump, a range and a dryer share them.
- All-electric backup. An air handler with heat strips adds a second large circuit, often bigger than the heat pump's own. This is the most common reason a heat pump job turns into a panel job.
Dual fuel skips the heat strip circuit. The gas furnace is the backup, and it only needs its normal 120 V supply.
On the quote
The electrical work should be its own line on the quote, covering the circuit, the disconnect and any panel work, priced before you sign. Send a photo of the open panel and its label, and we can check it before the visit.
Heat pump installation on unicolorado.com covers the electrical side in more detail.
Common questions
Does every heat pump need a new panel?
No. Many Denver houses have room for the circuit. A panel upgrade comes up when the panel is full, too small, or an all-electric design adds heat strips.