Ductless Mini-Split Installation in Boulder

Martin Acres' 1950s ranches are compact, and a two- or three-head system can heat and cool the whole house, letting owners retire an aging furnace. Table Mesa and Gunbarrel homes are bigger; there a mini-split more often serves a finished basement, an addition, or an upstairs bedroom the main system never quite reaches.

Downslope windstorms off the foothills have produced gusts above 100 mph, including 112 mph during the Marshall Fire. We use stands and wall brackets rated for the unit's weight, anchor them properly and keep them out of corners where snow piles up. A condenser sitting on the ground in a drift zone loses capacity right when you need it.

Boulder County's heating design temperature is 0°F. If the mini-split is meant to be your main heat, we size the heads from a room-by-room load and choose models with published output at 5°F and below. Indoor condensate runs to an interior drain or pump so it can't freeze outside.

A condenser in Boulder gets its own 240-volt breaker and a lockable disconnect beside it. In older homes we check panel capacity first, especially if you also plan an EV charger or induction range. The City of Boulder issues mechanical permits under its 2024 energy code, and we pull them and schedule the inspection.

Xcel Energy serves Boulder for gas and electricity, and its heat pump rebates changed October 1, 2026, so confirm current amounts with Xcel. Boulder is in DRCOG, so Power Ahead Colorado's $1,500 rebate applies to cold-climate heat pumps in existing homes when we submit before work starts. Colorado's $1,000 state credit also applies this year, and at least $333 of it shows up as a line-item discount. Boulder County's EnergySmart rebates are now limited to households at or below 100% of area median income. The federal 25C credit is no longer available.

Not every ductless project needs wall heads. A compact ducted air handler tucked into an attic knee wall or closet can serve two or three small upstairs bedrooms through short duct runs, which keeps the rooms looking original. Wall heads remain the most efficient and least invasive choice for open rooms and additions.

For whole-house conversions we often pair one multi-zone outdoor unit with a mix of wall heads and a ducted unit, sized from a room-by-room load. Oversizing is a real problem in mild Boulder weather: an oversized head cycles on and off and does a poor job of dehumidifying.