Tip & How-To about Heating & Cooling

I need to replace my ac but my furnace works fine. Do they need replaced at the same time?

Think of your air conditioner and furnace as part of a total system. That system will work better, longer and more efficiently if all of its components are matched in capacity and efficiency. By the same token, a mismatched system-one that mixes old technology with new-could decrease system performance and overall comfort.
For example, your new air conditioner will be capable of reaching a certain SEER efficiency rating. Because SEER is determined by a complete system combination, if your existing furnace and indoor coil are older or don't match in efficiency and capacity, you might not get the efficiency level you paid for or be able to receive accurate information on what your rating actually is. Plus, an older indoor coil may even be dirty and clogged with particles, meaning more energy will be required to push air through the system.

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My Maytag 90% plus funace you can only feel a slight air movement coming out of the ducts. My 80% one at home I could dry my hair from the vent. What is wrong with my 90% unit? should the air movement be better than nothing? It takes forever to heat or cool the place. Always running


First check to make sure that you furnace filter is not plugged. Now with that being said your furnace may be working exactly as intended if the motor is staged. The way a high efficiency unit works is slowing down the fan speed to maximize heat transfer from the coil.

My guess is that your furnace is working correctly (if filter is not plugged).

Jun 16, 2011 | Heating & Cooling

1 Answer

what is the efficiency rating on the Trane model BLU055E936B1 upflow furnace and what new furnaces are available to replace this old Trane furnace without having to change the venting system.


Chances are you need to replace both the condenser and furnace, then you you should get a varaible speed blower with the new furnace, get at least a 90% gas system with a 16 SEER condenser, save on energy cost as soon as it's installed. Go Get IT

Jan 28, 2010 | Ruud Central System Air Conditioner

2 Answers

I need help selecting the best Amana 5 ton furnace/ac.


I believe you are asking which furnace to go with?

Just some clarification first.

The "condensor" is the outdoor unit.
A "Compressor" is the device inside the outdoor unit that pumps and "compresses" the refridgerant.

An evaporator is the indoor coil, it has refridgerant running through it.

The furnace is completely seperat from the condensor and evaporator.

I "THINK" you are saying that you are looking to buy an AMANA system with a 5 ton 14 to 16 SEER condensor, and a furnace, but you need suggestions on the furnace.

typically when you purchace a condensor, the evaporator coil is simply matched by the manufacturer to the specific condensor you purchace, there is no choosing to deal with. All condensors ofcourse come with a compressor already installed.

If my assumption about your request is correct, maybe this will help.

Amana's 90+ furnaces are great units. I would recomend them to anyone. The 80+ uses a somewhat inferior heat exchanger, and is ofcourse less efficient.
Anything higher than a 90+ can take quite a while to recoup the costs of the enitial purchace through your efficiency savings.

If it were my home, I would go with the 90+ furnace, and the 16 SEER Condensor/evaporator system. But ultimatly, its up to you, your efficiency standards and your wallets potential.

If you live in a northern state where AC is little needed, I'd go with the 14 SEER AC.
Again, an initial cost verses long term savings issue.

Dec 09, 2008 | Amana Heating & Cooling

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