Here in the greater Fresno area, our semi-arid climate – hot, dry summers with mild, moderately wet winters – typically demands more of A/C equipment than of heating appliances. That said, our coldest months (December and January) see average lows drop to the high 30s. Having an economic heating system, then, is an important consideration to many homeowners, and Energy Star certified appliances are your best bet for energy-efficient HVAC equipment.