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Subject
Energy efficiency and electrification
Building envelopes, heat pumps, and Colorado energy code
In short
Energy efficiency in a Colorado home is decided by the envelope first: air sealing, insulation continuity, and window specification. Mechanical equipment choice, including whether to install a cold-climate heat pump, matters second and cannot compensate for a leaky envelope.
- The envelope decides everythingAir sealing, continuous insulation, and thermal bridging determine a Colorado home's comfort and energy use. Why equipment cannot compensate for a leaky shell.
- Do heat pumps work in Colorado wintersCold-climate heat pumps, backup heat strategy, and what altitude and dry air do to performance in Colorado homes, plus where they fit.
- Windows, and what to specify at altitudeU-factor, solar heat gain, capillary tubes, and why one window package for the whole home is the wrong answer in Colorado. A practical specification guide.
- What Colorado's energy code requiresHow energy code is adopted locally in Colorado, what the prescriptive and performance paths mean, and why code is a floor rather than a target.
Energy efficiency in a Colorado home is decided by the envelope, and everything else is secondary.
The hierarchy
Air sealing is the largest single factor and mostly a matter of labor and attention rather than material cost. It is accessible during framing and inaccessible afterward.
Insulation, including continuous exterior insulation, which interrupts the thermal bridging through framing members that ordinary cavity insulation cannot address.
Windows, specified by elevation rather than as a single package, and built for altitude.
Mechanical equipment, sized to the load the envelope creates rather than to a square footage rule of thumb.
That order is not arbitrary. Equipment can only condition the load it is given, and a large system fighting a leaky shell produces neither comfort nor efficiency.
What Colorado adds
Climate zones across the populated parts of the state run from 5 to 7, which is genuinely cold. Altitude affects window manufacture and equipment capacity. Ultraviolet intensity shortens the life of exterior sealants. The wide daily temperature swing means a poor envelope tracks the outdoor temperature in a way occupants feel directly.
Code is a floor
Colorado has no single statewide residential energy code. Jurisdictions adopt and amend editions of the International Energy Conservation Code locally, so requirements differ by permit office.
A home built exactly to code is the least efficient home that was legal to build there that year. The gap between minimum and genuinely good is small in cost and large in comfort.
Verification
Insist on a blower door test at rough-in, not only at final. A final test tells you what you built. A rough-in test tells you what to fix while the walls are still open.
References
Where writing in this subject rests on an outside authority, it is one of these.
Written and reviewed by Jason August, President and Employing Broker, Colorado license ER.040029060.ยท