5 Furnace Mistakes HVAC Companies Hope You Keep Making

Get The 30-Year HVAC Bible — Make Your Heating And Cooling System Last Decades Longer → https://liibro.com/l/hvac/john-the-hvac-guy Many homeowners unknowingly make furnace mistakes that benefit HVAC companies far more than themselves, and this video breaks down the five most costly ones in plain terms. Starting with filter selection, most people assume a higher MERV rating means better performance, but high-density one-inch filters can starve a modern furnace of airflow and trigger repeated high-limit trips that crack heat exchangers over time. Closing vents in unused rooms follows the same logic but causes the same problem. Before calling for a service visit, a simple walk-through checking the blower door, thermostat, condensate drain, and flue intake pipes can solve many no-heat situations for free. When buying a replacement furnace, contractors often copy the old unit's BTU input rating without accounting for the jump in efficiency, leaving homeowners with an oversized system. Finally, when a technician condemns a heat exchanger, most people never check whether their warranty — sometimes lifetime coverage — could dramatically reduce the repair cost, partly because a short registration window is easy to miss after an unplanned replacement. #hvac #furnace #homeimprovement #heating #diy #homerepair #energysaving #winterprep #homemaintenance #plumbing