I live in NE Texas where the temp is reaching 100 deg. this time of year. We just built a new 2900 sf house with spray in foam insulation. The hvac guy recommended a Lennox 4 ton 2 stage heat pump, XP16-048-230-03 with a ERV system. Is it common for this unit to run for 12 + hrs with out ever shutting off. It runs from low speed to hi speed back to low all day long. The temp is maintained to the degree, never going above set point. We built this house trying to save on our utility bills, but I don’t see how we are saving any if the unit never shuts off. Your thoughts please.