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-   -   need recommendation for central air model - second floor 1450 SF (http://www.diychatroom.com/f17/need-recommendation-central-air-model-second-floor-1450-sf-152457/)

denemante 08-03-2012 12:57 PM

need recommendation for central air model - second floor 1450 SF
 
I'm suddenly in need of new central air replacing one of my two systems. Sorry for the layman talk. I live in Atlanta and we hover in the high 80s to low 90s for 3-4 months at least.

My HVAC guy is going to give me more details, but he say just go with a Lennox 13ACX - that's the bottom of the line. I didn't yet hear what he was planning to do for the inside part (coils part?). But the total job including install/equipment was $2100. That sounded like a great price.

I even said I might want something better than "low end". He said "nahh, it would be fine. Don't pay more when you don't need to."

I read about that unit, and it seems solid - but perhaps underpowered and only a 5 year warranty. Also seems to be "featureless" - but not sure what features I'd need beside on/off.

I'd love your thoughts on this system.

My previous system was a 2-ton (unknown sear, but it's 14 years old). He recommended the 2.5 ton.

My upstairs is 1440 square feet. Two of those rooms have vaulted ceilings. The upstairs is also very open to the first floor. A hall upstairs becomes a catwalk that splits the two-story foyer and great room. So I do feel as though the upstairs unit actually partially cools the first floor too.

My ideal "budget" is to spend as little as possible. Yet that's balanced by knowing I also want it to last and be trouble-free. The most important factor, of course, is that it cools the house. I've never been able to even get close to what the thermostat is set to. I set it to 70, it's 90 outside, and it only cools to about 78. Now as it's failing - it can barely cool to 85 when it's 90 outside.

Any recommendations on a model number/system?

turnermech 08-03-2012 02:02 PM

for the money he quoted you and the fact that it is a five year warranty it sounds like just a outside unit. this would be dry from the manufacture and have to be charged in the field. It would use R-22 refrigerant. That refrigerant was phase out and can only be sold in new units as dry units.

To size the home if you feel 2 ton is not enough you need to do a load calculation. A lot more goes into one than square footage and area of the contry. Too big of a unit is worst than too small in many cases the main one being humidity removal. If you a/c is too big it does not run long enought when cooling to remove much humidity. In most cases a 2.5 ton would not work with out chaning the indoor unit and making changes to the ductwork.

scottmcd9999 08-03-2012 02:54 PM

Bottom end units are ... well ... bottom end. Granted a proper installation is the most important part of the matter, but a good installation of a higher end unit is better than a good installation of a lower end unit.

I'm not a big fan of current Lennox equipment, but then that's just me.

turnermech 08-03-2012 03:28 PM

You are the best input in sizing the unit. If the current size has preformed well than you will not benifit from increase in size. If the system struggled to keep up most of the time during normal high temps than an increase may be needed. Like I said before an increase most time requires other work.


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