New A/C system advice please.

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  #1  
Old 10-05-18, 06:32 AM
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New A/C system advice please.

My 44 year old 3 ton Carrier system, still blowing ice cold air, is in need of replacement. The air handler condensate catch pan has rotted out and it's dripping into the overflow. I thought it was gonna last forever, but everything has it's time. What a well built system !!

With that said, I've gotten a few quotes and would just like a few of the pro's to weigh in on them.

First guy quotes me a 3 ton Goodman with matching air handler, he's also changing the line set. He comes in at $5500, I like the idea that he's changing the line set, but he also tells me that Goodman is a builder grade unit. I don't plan on staying in this home too much longer, maybe a few more years at best.

My buddies brother who owns an HVAC company quotes me a 3 ton Rehm unit with a 3.5 ton air handler. He's flushing the line set, not replacing it. Although this might be considered better equipment, i'm concerned about the line set. He's also a grand higher in price at $6500. I think both quotes are very reasonable, but the line set has me a bit concerned.

Thought on the Goodman vs the Rehm? I do like the idea of the 3.5 ton air handler to help improve efficiency, but the line set has me re-thinking his quote.

Thanks in advance for the input !!
 
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  #2  
Old 10-05-18, 08:00 AM
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All other factors being equal the higher tonnage will actually decrease efficiency as the unit will cycle on and off more. Think of it as city driving vs. highway.
 
  #3  
Old 10-05-18, 10:46 AM
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if he is using r-11 flush then the line set is fine as long as it is the correct size. Id stay away from Goodman especial if you are moving in a few years. (resale value). Im not a big fan of the oversized AHU's on 410. R22 you could get away with it but i don't think 410 works as well with it. Did he say why is is using the 200cfm bigger unit did he?
 
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Old 10-05-18, 11:18 AM
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Airman - He did not say why, but I can and will question him on that. Good to know with the flush, he claims he's been flushing R22 line sets and hasn't had any issues with 410 equipment installed.
 
  #5  
Old 10-05-18, 01:51 PM
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As long as the lineset is properly brazed, is the correct size, and not damaged, there isn’t anything wrong with reusing it.
 
  #6  
Old 10-06-18, 03:55 AM
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I like the older equipment since it usually of higher quality and built to last. I would try and fix the condensate pan before I replace the whole system. Just a thought.
 
  #7  
Old 10-08-18, 07:08 AM
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Steamboy - believe me I've thought about that. But at 44 years old, and an energy hog to beat, I think it's time for it to go.
 
  #8  
Old 10-09-18, 03:23 AM
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If you look at the replacement cost of the A/C as an investment, the payback for your investment from the cost savings for a more efficient unit will be way into the future. So if the operating cost savings is your reason to buy a new unit then that is a terrible investment. However if a new unit is actually needed then it is the right decision. Just some thought.
 
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