heat pump question

[AHI in AR]

 

Long time, no see here but I have a question.

Came across something I have not seen previously. New construction with three heat pumps, the outdoor units all had the form factor you expect for mini splits. However, they were hooked to conventional air handlers and ducting inside. I'm not sure if this is the face of the future, or if somebody did something a little outside of the box. My question has to do with temperature differentials. Should I expect the same temperature differential with these and the "old school" style big boxes outside?

[Bill Kibbel]

I think there are a couple manufacturers of systems with air handlers paired with "slim" outdoor units.  If you grab the model #s, you can check compatibility.

I've found no difference in operation.  But, it's more likely for the systems with the slim outdoor units to have inverter tech and some have the hyper heat for really cold climates.

 

[Jim Katen]

What Bill said. 

I see the rather often. As I understand it, their variable speed compressors and variable or multi speed blowers will not always provide the traditional temperature differential. 

 

 

[AHI in AR]

Thanks to all for the replies.

[davidkoperty]

Do you know if the air handlers are properly matched to the mini-split outdoor units’ capacity? Generally, as long as the system is correctly sized and balanced, the temperature differential should be similar, but mismatched components or long duct runs can reduce efficiency and airflow. 

Edited February 21 by davidkoperty

[jacobdhempsy]

It sounds like they’re using mini-split-style heat pumps with traditional ducts, so the temperature differential might be slightly lower than conventional large outdoor units, but efficiency can still be comparable depending on system design.

[davidkoperty]

Using multiple mini-split style outdoor units with conventional air handlers can still deliver good temperature differentials similar to traditional big-box systems if properly sized, and consistent airflow is maintained. The Frigidaire FFPA1422U1 use and care manual highlights tips for efficient operation, maintenance, and troubleshooting to ensure optimal cooling and energy efficiency, which applies well when integrating new configurations like this, keeping systems balanced and performing as expected.

[Astairh]

David, I agree with your point about proper matching and airflow being key, as long as the air handler and outdoor unit are correctly paired and the duct design isn’t excessive or restrictive, the temp split should generally fall within expected ranges.