What brands/models offer demand defrost control on HP's?

[markf57]

I'm trying to find which brands and/or models offer demand defrost control on HP's? Seems like hard info to find.

Also, which brands don't would be just as helpful.

[mark beiser]

All American Standard and Trane heat pumps have demand defrost.
Lennox uses demand defrost on their top end units, I'm not sure about their lower end units.
I think Carrier uses it on some units, I'm not sure though.
Rheem/Ruud use it on at least some of their units.

I have no idea what other brands are doing on their newer equipment.

[BaldLoonie]

York uses it on a lot of units
I don't think Carrier/Bryant use it at all
Rheem/Ruud and even the cubes use it

[rheem n u]

all of rheems have it even have it,even the corse air line

[tact1999]

What about Goodman?

[markf57]

I don't think Goodman/Amana have it. But I wish they did.

[tecman]

I have a 1.5 ton Goodman with demand defrost.

I retrofitted it myself using a YorkGuard IV controller from leftover part stock. Works great and rarely defrosts, only when needed, as advertised.

It was not a difficult retro, but having all of the parts and sensors available was a key part. I actually did it in the mid of the first winter season when I got tired of hearing it defrost every 90 minutes, and not seeing any frost.

paul