Your Navajo Heating and Cooling Experts
The federal minimum efficiency standards for new AC equipment changed in 2023, and they vary by region. New Mexico falls in the southern efficiency region, meaning new AC installations in McKinley County must meet the 15 SEER2 minimum — not the 14 SEER2 that applies in northern states. Higher-efficiency equipment costs more upfront but reduces operating costs over the system's life. In Navajo's climate with its extended cooling season, the payback on higher SEER2 equipment comes faster than it would in a market with a shorter AC season.
McKinley County's dry heat reduces humidity-related issues but amplifies dust accumulation on condenser coils. Restricted heat rejection at 105°F+ ambient temperatures drives compressor head pressure to failure-inducing levels. Annual condenser cleaning is the single highest-impact maintenance task for Navajo AC systems.
Navajo's extended cooling season generates approximately 3,280 cooling degree days of annual energy demand. Homes built around 1975 — the median construction year in McKinley County — are at the age where original air conditioning equipment has either been replaced once or is overdue for evaluation.