HVAC system

How Proper Sizing Matters for Your HVAC System

April 25, 2020

If you’re shopping for a new furnace or air conditioner for your Fairfax, Virginia, home, you’re probably thinking about equipment features, SEER, and AFLUE ratings. However, HVAC system sizing is one of the most important considerations for comfort and efficiency.

The Importance of Correct HVAC System Sizing

When it’s time for an HVAC replacement, some contractors just swap out systems for a similarly sized unit. At Vernon The Heating & Cooling Specialist, we perform detailed sizing calculations for each customer and each installation. In many ways, it’s the most important step in the replacement process. Here’s why.

  • Proper sizing calculations help your HVAC system deliver balanced airflow to each room.
  • Oversize AC equipment cools the air too quickly, which prevents optimal humidity control.
  • HVAC systems that aren’t sized as recommended are prone to unnecessary wear and tear.
  • Rule-of-thumb calculations tend to recommend oversized equipment, which inflates your costs.

HVAC Equipment Capacities

Residential HVAC equipment is available in a wide range of capacities designed for condos and apartments as well as spacious multistory homes. Central air conditioners and heat pumps go from 1 to 5 tons, and systems are available in half-ton increments. Furnaces are typically rated according to their BTU capacity.

HVAC System Sizing Formulas

Our contractors use sizing formulas outlined in Manual J, a load calculation guide published by Air Conditioning Contractors of America. Here are some of the key points.

  • Assessing your building’s square footage is an important first step to ensure that your new heater or air conditioner fits your needs.
  • Our sizing calculations compensate for household activities that generate heat and humidity.
  • Heat gain from sun exposure is another important consideration since it affects your home’s heating and cooling needs.
  • We also assess your home’s insulation envelope to estimate potential energy losses.

If you’d like to learn more, call Vernon The Heating & Cooling Specialist to schedule a free estimate at your home or business. Additional information about our HVAC installation services is available online.

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