A blower door test puts the house under pressure with a calibrated fan and measures how much air leaks out, giving a number rather than an opinion. It is the step that tells you whether the problem is the heating equipment or the building around it. Houses that fail on comfort rather than equipment usually leak at the rim joist, attic hatch, recessed lights, plumbing and wiring penetrations, and around the chimney chase.
This matters in Shaker Heights, OH because a furnace that looks oversized and short cycles is often correctly sized for the house as it was built and wrong for the house as it is now, or the reverse after insulation work. Testing before replacing equipment stops you buying a bigger system to cover a problem that sealing would fix for less. The test is also repeatable, so the work can be measured afterwards. Pro HVAC connects homeowners in Shaker Heights, OH with HVAC professionals. Call (321) 463-9811.