Ductless or ducted HVAC? In a DOE field study, adding one ductless head to leaky-duct homes cut median cooling energy 37%. See which homes fit each system.

Heat pump vs furnace math: against propane a heat pump needs only a 1.84 COP, against gas 3.92. Your zone and utility rates decide which side you’re on.

Crawl space dehumidifier specs hide a cold-weather catch: one pick starts at 50°F, another runs to 33.8°F. See which fits a space that dips into the 40s.

A CO detector for a gas furnace home belongs on every level and outside each sleeping area. Here’s which alarm fits each spot, and which to avoid.

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.