[RFI] HVAC Variable Speed Motors

W2RU - Bud Hippisley W2RU at frontiernet.net
Sun Apr 11 05:47:53 PDT 2010

On Apr 10, 2010, at 7:43 PM, Hardy Landskov wrote:

> Of course now the natural question is the following:
> I am going to be in the market for a new heat pump this Summer. Does anyone out there have a make/model number of a heat pump that does not use PWM circuitry?

Hardy --

Even though I used to call on Carrier AC's engineering department, I'm no expert on heat pumps, but in researching the York HVAC site I did note that they seem to have non-PWM models right next to the PWM models like the Affinity series.  Just google your favorite manufacturer or google the brand carried by your favorite local HVAC dealer/contractor.

These PWM models seem to have gained traction because of the current IRS tax credit for high SEER units.  I suspect they're more expensive, for equal heating / cooling capacities, but up here in the frozen north we don't see many heat pumps of any kind....:-)

You could always procrastinate until the tax credit time frame runs out, then you will have no reason at all to buy a PWM version.

Bud, W2RU

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