For a high quality split home comfort system, I would recommend that you look into the LENNOX line of systems. They have a 94% eff. natural gas fired furnace that you can match with a 15 SEER hsx15 CONDSER AND A ASPEN EVAP COIL AND PULL 16 SEER. The furnace is a two stage variable speed unit...
A heating and cooling load calculation of the space to be conditioned will give required cfm for for your application. Always size to the larger duct when utilizing ducts for heating and cooling. Heating does not require as many cfms as cooling does.
Yes KENRAD, thats right. I have dealt with 90% split systems for residential applications. I have not been able to offer lght commercial pack units with the higher eff. on the heating side of the system. I can imagine that there are some obstacles to this. I would like to be able to put high...
I do not beleive that 2 fans in series will give 24oo cfm through a duct system. I think it is just like using 2 8" ducts to provide the same airflow as a 16" duct, it doesn't work.
you could simply install a duct heater into the supply box, directly after the air handler. you can wire in sequence with units controls. this can also have a variable speed fan motor for cfm requirments. Make up air is a good idea, you could probably tie a fresh iar duct into yhe return box...
