Utah HVAC Load Calculation Guide
Utah's Wasatch Front inversion — where Salt Lake Valley air quality can be among the worst in the US for weeks in winter — makes ventilation and filtration design as critical as thermal performance, while St. George's desert heat and Park City's altitude create two entirely different HVAC contexts within 250 miles.
Try the Utah HVAC Load Calculator
Get a preliminary estimate using Utah-specific design temperatures. Our heating load calculator uses ASHRAE methodology with the local climate inputs below.
Design Temperatures
| Parameter | Value | Source |
|---|---|---|
| Winter Design Temperature (99%) | 5°F | ASHRAE Handbook 2021 |
| Summer Design Temperature (1%) | 97°F | ASHRAE Handbook 2021 |
| IECC Climate Zone(s) | 3B (Warm - Dry), 5B (Cool - Dry), 6B (Cold - Dry), 7 (Very Cold) | ASHRAE 169-2021 |
| HVAC Load Type | Heating-Dominated | — |
Utah Building Codes & Energy Requirements
| Requirement | Detail |
|---|---|
| Energy Code | Utah Energy Code (2018 IECC with Utah amendments, adopted 2022) |
| Minimum SEER | 14.0 SEER (federal minimum) |
| HVAC License Required | Yes — Utah Division of Occupational and Professional Licensing (DOPL) — HVAC Contractor license required (S330 class) |
| Average Electricity Rate | $11.48/kWh (US average: $0.1701/kWh) |
Major Cities — Design Temperature Reference
| City | Summer Design (1% DB) | Winter Design (99% DB) | Load Type |
|---|---|---|---|
| Salt Lake City | 97°F | 5°F | Heating |
| West Valley City | 97°F | 5°F | Heating |
| Provo | 97°F | 5°F | Heating |
| West Jordan | 97°F | 5°F | Heating |
| St. George | 109°F | 5°F | Cooling |
Quick Facts
- State: Utah (UT)
- Climate Zone(s): 3B, 5B, 6B, 7
- Winter Design: 5°F
- Summer Design: 97°F
- Energy Code: Utah Energy Code (2018 IECC with Utah am...
- Avg. Electric Rate: $11.48/kWh
- License Required: Yes
Utah HVAC Challenges
- Salt Lake Valley inversion trapping air pollution for weeks in winter — ventilation and filtration are critical
- Altitude derating required — Salt Lake City at 4,226 ft and Park City at 7,000 ft affect equipment ratings
- St. George (southwest Utah) is one of the fastest-growing US cities with 109°F summer temperatures
- Ski resort HVAC (Park City, Alta, Snowbird, Deer Valley) operates at 6,000–10,000 ft elevation
- Great Salt Lake desiccation increasing dust and particulate concentrations across the Wasatch Front
- LDS/Church of Jesus Christ meetinghouse construction at high volume sets large-scale HVAC demand
Local Utilities & Resources
- Rocky Mountain Power (PacifiCorp) (investor-owned)
- Dominion Energy Utah (investor-owned)
- Dixie Power (cooperative)
Utah HVAC FAQ
The ASHRAE winter design temperature for Utah is 5°F and the summer design temperature is 97°F. These values are used for heating and cooling load calculations per ACCA Manual J methodology.
Utah spans 3B, 5B, 6B, 7 per ASHRAE Standard 169-2021. This classification determines minimum insulation requirements, energy code compliance path, and HVAC equipment sizing parameters.
The required HVAC size depends on home square footage, insulation levels, window area, and orientation. For a typical 2,000 sq ft home in Utah, use our heating load calculator with the local design temperature of 5°F (winter) or 97°F (summer) for a preliminary estimate.
Utah Division of Occupational and Professional Licensing (DOPL) — HVAC Contractor license required (S330 class)
Utah follows the Utah Energy Code (2018 IECC with Utah amendments, adopted 2022). This code sets minimum requirements for HVAC equipment efficiency, duct insulation, envelope insulation, and ventilation.
Design Guides & Standards for Utah
Explore related resources for accurate HVAC sizing.