Which of the following two systems would you recommend? I'm curious to hear of the benefits the Trane system would offer over the Lennox, since I am currently leaning toward the Lennox XP21.
XP21-048 heat pump
CBX32MV-060 air handler
"EvenHeater" 20 KW heater package
4TWX6048G1 heat pump
TAM7A0C48H41 air handler
15 kW heater package
XL802 t-stat (no humidity control)
Question on ductwork size: The Lennox dealer plans to install a 20 kW heater package (this dealer verified this to be the required size by doing a load calc), and the Trane dealer worries about getting the required airflow (2000 cfm?) for the 20 kW heater given my existing ductwork. The duct sizes installed are:
-20x14 return including 8" tapped in just before media filter serving basement
-16x8 (after transition from 14x8 off plenum), 8x8, and 12x8 supply
Dealer says the return is capable of 1650 cfm + 250 from the 8" for the basement. I did not ask him about the supply -- can it handle enough airflow for a 20 kW heater?
Thanks for any thoughts you can offer regarding the two systems I have to consider.