Ductless Mini-Split Installation in Lone Tree

The median home in Lone Tree was built in 1997, and gated Heritage Hills is typical of that era: ducted two-stories with basements. Mini-split calls here involve bonus rooms, home offices and finished basements. As a gated community, Heritage Hills likely has design guidelines, so check them before choosing an outdoor location.

Out in Grand View Estates, the houses are mostly 1970s builds sitting on an acre or more. Some of those houses have additions, sunrooms or detached garages that the original system never served. A single-zone unit is a good fit, and larger lots make it easy to tuck the condenser out of sight, within the manufacturer's line-length limits. Our guide to mini-splits in older homes covers retrofit layouts.

In a rowhome bedroom, a wall head high on an interior wall is the simplest and most efficient option. In a condo with large windows and little wall space, a floor console under the window can work better. If you want two or three small upstairs rooms served without visible heads, a compact ducted air handler in a closet or attic can feed them through short ducts from one multi-zone outdoor unit.

We size each indoor unit to its room. Oversized heads short-cycle, which wastes energy and leaves summer air damp.

Air at this elevation is thinner, which slightly reduces how much heat a coil moves at a given fan speed. Manufacturers publish altitude correction data, and we use it instead of the nameplate rating. Douglas County's heating design temperature is 4°F, so we also choose cold-climate models with published capacity at 5°F and below.

Sun is stronger up here too. A west-facing upper bedroom can need noticeably more cooling than the same room facing north, and we size for that.

Outdoor units sit on stands above snow, away from roof edges and gutters that drip and refreeze. Indoor condensate runs to an interior drain or a pump. For condos without an easy drain, a small pump hidden in the line-set cover is common.

The City of Lone Tree Building Division accepts applications electronically only. We submit the permit and coordinate the inspection. Each outdoor unit needs a dedicated 240-volt circuit and a disconnect; in condos the electrical panel may be in a different spot from the head, which affects routing.

Lone Tree is in DRCOG, so Power Ahead Colorado's $1,500 cold-climate rebate is available for existing homes, filed by the contractor before work begins; homes under construction don't qualify. The 2026 Colorado credit provides $1,000 per qualifying system, at least $333 of it as a direct reduction on the invoice. Xcel serves the city; its heat pump rebate amounts changed October 1, 2026, so get current figures from Xcel. Federal 25C ended with 2025 installations.