Seer Heater

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Air Conditioning SEER Rating - What does it Mean to YOU?



When the Central A/C unit is changed the the heater have to be changed?

We live in AZ, the furnace is more for air handling than anything but we need a new outdoor unit, we are upgrading from a 11 seer Goodman to a 16 seer Bryant a/c unit. Does the furnace part need to be changed?
Thanks

It depends, you have a lot of options, before I go to far here you need to first understand that the a/c is a system which includes the outdoor unit, indoor coil, and furnace (since the blower for the a/c is in the furnace) as well as ductwork.

1. If you are upgrading the outdoor unit to a 16 seer, and leave the rest of the equipment your system will not opearte as a whole at a 16 seer level, since it will be matched up with a less effecient indoor coil and blower. Yes it would be more effeicient than what you already have but like I said you wouldn't have the 16 seer. Also if you keep the indoor coil which is connected to the outdoor unit you will need to replace the metering device at the inddor coil to match the 410-a in the outdoor unit, I'm guessing the indoor coil and the unit you currently have is set for r-22 or freon.

2. A better option would be to replace the outdoor unit as well as the indoor coil, that would increase the seer more and you wouldn't have to bother matching the metering device. Systems will operate better together when matched or atleast operate to design. Other thing to consider is indoor coils will typically begin to leak refrigearnt after around 10 years due to the corrosion caused by the condesation, and since r-410a operates at 50% higher pressures, a leak at the inddor coil will become more severe over time.

3. Best option would be to replace all three, In order to get the 16 seer you'll need a variable speed blower motor which operates with less energy.

4. Last consideration is your ductwork, I've done a/c service work in Phoenix for 2 summers and I know that every return air duct is undersized, Having this will cut down on the efficiency, and if you have a variable speed blower put in it will decrease the life of the motor, if you keep the old furnace the life of the PSC motor is not effected by this but instead the amount of airflow is decreased which will also decrease the seer, that is having poor ductwork, ecspecially undersized return air.

If it was me and I know money is tight for just about everyone, I would look at replacing both coils, indoor and outdoor and leaving the furnace. Also Bryant I'm not big on. I would rather have a 14 or 15 seer lennox or trane, but thats just me, if you do the bryant look into an extended warranty. Last I remeber some manufacturers were giving away free 10 extended warranties with their equipment, so I would consider that as well, more so than just looking at the seer rating, because unless you go through and have all the bells as whistels done you will not see the full seer rating, ecspecially with that poor flex duct they run all through the attic in AZ that sits in 150F heat and isn't sealed very well.

good luck

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