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I have 15 yr old Amana AC on roof and Hiel Gas furnace. Both working good but of course not effecient. I wan to replace the AC but told its necessary to do both as they must be compatable. The one now is not the same mfg.So, can i just replace the ac uni

Post created: 2013-05-10 Type of Equipment: Air Conditioner Views: 491

This question was created on the page: https://www.furnacecompare.com/buying_a_furnace.html.

Is it necessary to up date units that still work great but old. Gas furnace 17 Heil and Amana ac 16 but uses f22


On 2013-05-10 JB wrote:

Are both the furnace and AC the same age?

Generally speaking you don't have to replace them both at the same time, but it may be a good idea because you gain some efficiencies on the install that can mean a lower overall price than doing each separately. Also, given that the AC and furnace are different brands you would probably simplify your life by going with a single brand rather than two. This could mean less headaches when you need to have work done and may be better in terms of the warranty. Also, the install will be much easier because many HVAC techs are certified in specific brands so a single brand system will probably lead to a better installation. This isn't to say they won't have multiple certifications, but it is something to consider.

Also, from what I have read, you will want to be sure the systems--whether they are two brands or one--to be properly matched for size otherwise you may have issues with efficiency and so on.

Also, you want to get at least two more estimates before making any decision. There may be circumstances that I am not aware of that could influence your decision one way or the other. Plus you will gather more information from each estimate.

So in the end, I would consider replacing both with a single brand if both the furnace and Ac are the same age and in need of replacing. However, there is no hard and fast rule that you must replace both or that it must be a single brand.

For a good debate you can go here: http://answers.yahoo.com/question/index?qid=20110609061644AAyuuLf.

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.


On 2013-05-10 wrote:

Thanks for the response. Both are same age and no problems since 2009. Has only been used about 4 months a year as in a snowbird condo. Now its used full time. I hesitate buying new as the reputation of this furnace has been very good. As to the AC, from what I read they all have serious coil leaking problems so how do you decide to buy anything new. AS a senior don't have lots of money to spend and then have a multitude of repairs to keep the new units running.


On 2013-05-12 JB wrote:

I can definitely understand your reticence for purchasing a new system. My first suggestion is bringing in a different HVAC tech, preferably one who is certified with this brand of AC, and have them do an inspection. They will be able to tell you the state of the unit. Perhaps since it has seen little use it may be in better shape than one that has been used more frequently.

However, the average life of an AC and/or furnace is about 15 to 20 years, though you hear of some going longer. Also, since yours was installed in 1998 it will be more efficient so you will receive savings in utility bills.

Otherwise, a good key test of a system is whether it is cooling properly and if there are any strange sounds coming from it (anything other than the normal hum of the compressor and so on). Also, when you look at its repair history is there a noticeable increase in the need to bring out an HVAC tech?

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.

Hope this helps.


On 2013-06-18 Khan wrote:

It's all about air flow. If you have a good air flow then it shouldn't be a problem to change the a/c.


On 2014-02-01 wrote:

I built my home back in 1959, installed a Westinghouse hundred thousand BTU out put and 125,000 input. Installed a 3.5 ton Trane AC unit and never,never had to add R=22 from the day I started it back in 1966. Was talked into replacing those old units and updating to new furnace and AC units. I did in 2007, will not go into details but I am sorry, new units will not keep up on heating or cooling with temperatures above 90 degs and below 10 degs. Does that answer any questions? I am a AC and Heating Service Engineer retired.


On 2014-02-01 wrote:

tHANK U FOR REPLY. IN OCT I REPLACED BOTH THE AC AND GAS HEAT WITH TRANE UNITS. AFTER SIX MONTHS OF LOOKING AROUND I FINALLY FOUND A LOCAL AC CO, PRIVATE OWNED THAT INSTALLED BOTH UNITS OVER $1500 LOWER THAN ALL THE REST AND TALKED TO OVER 8 GUY. SOME NEVER BOTHERED TO GET BACK WITH A QUOTE WHEN I ASKED QUESTIONS THAT LET THEM KNOW I WAS AWARE OF WHAT I WANTED. BOTH NEW UNITS PASSED THE COUNTY INSPECTION WITHOUT ANY PROBLEM. THIS SITE DID HELP ME MAKE A GOOD DECISION AND I APPRECIATE THE HELP.


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