Day and Night Deluxe 15 PHR5 is a mouthful. It’s full name is the Day & Night Constant Comfort Deluxe 15 Packaged Heat Pump PHR5. Efficiency ratings top out at 15.5 SEER on this model.
The Day and Night PHD4 Constant Comfort 14 packaged heat pump, is very similar to its big brother the Deluxe 15. This model however utilizes a single-stage compressor as opposed to the 15’s dual-stage.