Ductless Mini-Split Installation in Longmont

Prospect New Town, begun in the mid-1990s, has compact lots, porches close to the sidewalk and garages off alleys. A rear-wall bracket is often the tidiest spot for the condenser. If you have a room above a detached garage, a single-zone unit is usually far easier than extending the house's ducts.

In Longmont's mid-century and later suburbs, mini-splits most often solve a basement, a converted garage or a hot upstairs bedroom.

Boulder County's design temperature is 0°F, and the city's record low is -38°F, set in 1930. We size for 0°F and choose cold-climate models with published capacity in single digits. The outdoor unit sits on a stand above the roughly 32 inches of snow the city gets in a typical year, and condensate from indoor heads is routed to an interior drain or pump so it can't freeze in an exterior tube.

Because LPC is city-owned, Xcel's electric heat pump rebates generally don't apply to these addresses. Instead, LPC offers rebates through Efficiency Works using a participating provider, and you apply within 45 days of installation. Efficiency Works also advertises a $2,000 bonus when a heat pump is paired with envelope upgrades. Per-unit 2026 amounts weren't verified, so check Efficiency Works before you sign.

Xcel still supplies gas locally, and installer summaries say some Xcel programs consider gas customers; confirm with Xcel.

Longmont is in DRCOG, so Power Ahead Colorado's $1,500 rebate can apply to a cold-climate system in an existing home if we submit before work starts. On top of that, the state's 2026 heat pump credit is worth $1,000, a third of which must reach you as an invoice discount. Federal 25C ended after 2025.

The city's Building Services division issues permits at the Development Services Center on Kimbark Street. We pull the permit, run the dedicated 240-volt circuit and disconnect, and schedule the inspection.

We size each head to the room it serves rather than the square footage of the house. For a single room, a single-zone unit is the most efficient choice. For a whole older house, a multi-zone outdoor unit or two single-zone units can cover the main floor and upstairs, depending on how the rooms connect.

Head placement in old houses takes some thought: we avoid plaster walls with knob-and-tube wiring behind them, keep heads off chimney chases, and plan the line set so it runs through framing rather than through original trim.