Yes — with a Manual J load calculation, not a rule of thumb. We measure and model your actual home rather than multiplying square footage by a number, because sizing errors are the most common and most expensive mistake in AC installation.

What Goes Into the Calculation

  • Square footage, room layout, and ceiling height
  • Attic and wall insulation levels
  • Window area, glazing type, and which direction each faces
  • Sun exposure and shading
  • Air infiltration and how tight the building envelope is
  • Occupancy and internal heat loads
  • Existing ductwork capacity and return air
  • Albuquerque’s elevation, which affects air density and rated capacity

Why Oversizing Is the Bigger Risk

Most homeowners assume a larger unit is safer. It is not. An oversized air conditioner cools the air quickly, satisfies the thermostat, and shuts off — short cycling that never runs long enough to mix air between rooms or pull humidity out. The results are the exact complaints people are trying to solve: uneven temperatures, a back bedroom that stays warm, clammy air during monsoon season, higher bills, and more wear because startup is when components fail.

Undersizing Has Its Own Costs

A unit too small runs continuously and still loses ground on a 102-degree afternoon, driving up bills while never quite reaching setpoint.

The Albuquerque Wrinkle

Elevation reduces air density, which changes real-world equipment capacity — a system sized by sea-level rules of thumb behaves differently here. Our housing stock also spans seven decades, from uninsulated mid-century frame to modern tight construction to thick-walled adobe with completely different thermal behavior. Two houses of identical square footage on the same street can need genuinely different equipment.

Ductwork Is Part of Sizing

Correctly sized equipment on undersized or leaky ducts still underperforms. This comes up constantly on homes converted from evaporative cooling, where the original duct system was never designed for refrigerated air. We evaluate duct capacity and return air as part of every quote.

Getting this right is the difference between fifteen good years and fifteen frustrating ones. Contact B. Carlson for a load calculation before your AC installation or replacement in Albuquerque.