What Do the Experts Say

  • National surveys have determined that well over half of all HVAC contractors do not size heating and cooling systems correctly.
  • Owners should insist upon a correct system sizing calculation before signing a contract.
  • NEVER use any of these methods to determine final size
      • Contractor recommends existing size
      • Contractor bases size on square footage

--Bulletin: United States Department of Energy

  • Finding a trustworthy contractor matters
  • Contractors should calculate required
    cooling and heating capacity by using a
    recognized method…
  • Be leery of a contractor who bases
    estimates merely on house size or vague
    rules of thumb.


-- May 2001 issue of Consumer Reports