Hello,
I received quotes from a few vendors to update my central heating system, all offering about the same things (2T variable speed heat-pump + variable speed air-handler with 15KW heat strip and high-end wifi thermostat).
The vendor selling Trane was clear that the electric heat was modulated based on demand. For example, if it's -20C outside and the heat-pump can't provide enough heat, it will keep the heat-pump working at its max and add only 5KW of electric heat to compensate. Let's say the house needs 30,000 btu to stay warm but the heat pump can only provide 13,000 btu, the thermostat would only ask for one 5KW strip (~17,000 btu) to kick in. By opposition, other systems would stop the heat pump completely and only heat with heat strips (full 15KW in an on and off cycle) until outside temperature comes back to a level where the heat pump can suffice.
I got quotes for Carrier and Lennox as well for similar systems, but did not get clear explanation of such feature. I heard about "heat strips sequencing", but I suspect that's not the same. Do we know if that feature (modulating) is available with Carrier and Lennox as well?
Note that I'm leaning toward the company selling Carrier, so I'm mostly interested in whether Carrier can support heat strips modulating. The air handler they quote me is the Carrier "Performance Fan Coil FV4C", but can't find any clear indication of such feature on the Carrier website.
Thanks,
Larry
P.S.: In a colder climate, I assume such feature can help save even more energy and keep CFM and indoor noise lower.
I received quotes from a few vendors to update my central heating system, all offering about the same things (2T variable speed heat-pump + variable speed air-handler with 15KW heat strip and high-end wifi thermostat).
The vendor selling Trane was clear that the electric heat was modulated based on demand. For example, if it's -20C outside and the heat-pump can't provide enough heat, it will keep the heat-pump working at its max and add only 5KW of electric heat to compensate. Let's say the house needs 30,000 btu to stay warm but the heat pump can only provide 13,000 btu, the thermostat would only ask for one 5KW strip (~17,000 btu) to kick in. By opposition, other systems would stop the heat pump completely and only heat with heat strips (full 15KW in an on and off cycle) until outside temperature comes back to a level where the heat pump can suffice.
I got quotes for Carrier and Lennox as well for similar systems, but did not get clear explanation of such feature. I heard about "heat strips sequencing", but I suspect that's not the same. Do we know if that feature (modulating) is available with Carrier and Lennox as well?
Note that I'm leaning toward the company selling Carrier, so I'm mostly interested in whether Carrier can support heat strips modulating. The air handler they quote me is the Carrier "Performance Fan Coil FV4C", but can't find any clear indication of such feature on the Carrier website.
Thanks,
Larry
P.S.: In a colder climate, I assume such feature can help save even more energy and keep CFM and indoor noise lower.
source https://hvac-talk.com/vbb/showthread.php?2222478-Can-air-handlers-with-heat-strips-modulate-heating&goto=newpost
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