Quote:
Originally Posted by ecomodded
In some case a inverter model will not save much money over a non inverter unit
For a non inverter I would size to your homes average winter BTU consumption and no higher. My non inverter 12000 BTU model runs 24-7 throughout winter heating 900 sq.ft of a 1900 sq. ft two story house so im my case I would see little savings if the heat pump had a inverter. For me not enough of a savings to warrant the price of a inverter pump.
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I would always go with the inverter unit -are they really more expensive at this point?
A single speed unit operates at nameplate (with temperature (reality) related capacity curve) - but the inverter units can actually supply their nameplate output at lower temperatures than the non-inverter units, by over-speeding the compressor.
If you size to average heat demand, all of the periods in winter with more demand (colder than average) mean your unit will not be able to maintain setpoint.