Nobody wants to have to deal with putting in a new central heating system in the middle of winter, but if your old heater has to go, or you’re in a new house that hasn’t had its first installation yet, then you don’t have much choice. But as long as you rely on professional HVAC service in Lansdale, PA, there’s no reason the replacement/installation shouldn’t go fast and end up delivering you the exact right heater for your needs. And a big part of doing the job right is accurately sizing the new heating system.