Foundation & Structure

Smart thermostats for heat pumps aren’t interchangeable: Amazon’s skips dual fuel, while ecobee’s Premium runs two aux stages. Find your system’s match.

Furnace filters for allergies, pets and smoke need different MERV ratings, and HVAC systems rarely list their limit. Here is how to match yours.

Hiding an outdoor AC unit for shade savings? A Florida field study measured under 3%, so plan for looks and keep the top and service side clear.

Choosing an HVAC contractor? The FTC calls asking you to get the permits a scam sign. Six free lookups show who else to skip.

A Manual J load calculation uses your home’s real numbers. ACCA’s 8th Edition is the ANSI-recognized standard; here’s how to request one.

Seal duct leaks by gap size: DOE says mastic alone won’t bridge anything over ¼ inch. See what to use instead and which jobs belong to a pro.

Flush AC drain line steps vary by brand: Carrier says one cup of vinegar, Lennox says dilute it and soak 30+ minutes. See where they differ.

Finding your HVAC unit’s age starts with the data plate. Goodman’s own FAQ says where its serial number sits and who should help you reach it.

HVAC filter size sits on the frame as three numbers. Read them, or measure the slot and round up, then check thickness and fit before you buy.

HVAC systems and R-410A: existing units can keep running and be repaired, per EPA. See what actually changes when you replace one.