The season is changing May 4, 2022 1:10:06 GMT -2 Quote Select PostDeselect PostLink to PostBack to Top Post by Admin on May 4, 2022 1:10:06 GMT -2 Are you thinking about a replacement furnace, boiler, heat pump, or air conditioning?See the FAQ's discussing why it needs to be properly sizedwww.comfort-calc.com/faq.cfmand benefitswww.comfort-calc.com/BenefitsHeatLoss.cfm