I am working on a M # GPG13420901AB. This is a 3.5 ton package unit that replaced a 3 ton package unit on 1700sq/ft single level home. Old unit was working fine but was replaced when the home was renovated. The new unit will not hold temperature in the home when outside ambient climbs above 83-85 degrees. Refrigerant pressures early in the day (70-80 degrees ambient) look fine 70 suction 200 high 9-11 degrees SH. Late in the day with outside ambients around 90-95 degrees, inside temps 75-78 degrees the pressures seem to run out of control. Suction goes to 80 - 85 however the high still lingers around the 200-225 mark. Super Heat runs to 15-20 degrees. Insulation has been added as well as some duct modifications to ensure air flow with no success. Help me out. CD

Read size of air conditioner you need , each ton of air conditioning will keep cool 400 square.so higher ton yo pick you feel cool.please read below square feet to ton chart.
1 ton on 400 sq. ft.
2 ton on 800 sq. ft.
3 ton on 2000 sq. ft.
5 ton on 2570 sq. ft.

You say 2 to 3 years... I'm assuming the unit is older than that. Especially being r22. What about the first 10 years??? Normally you will get 400 to 500 sqft per ton of cooling, but, that depends on heat load calculations. If the unit wasn't big enough you would have had this issue 10 years ago, not when the system kept running low on refrigerant. At first guess I would say a 2 ton unit is not big enough but if it worked fine for 10 years...wuth all that in mind, if it were me, (a seasoned professional) I would spend 1800 to fix my 15 year old r22 unit before I spent $4000 on a new r410a piece of junk. Best Wishes!!

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Its a bit more difficult than just the duct size, are you going to take it to other rooms? ect.. My advice is have it designed for the space.

depending who you talk to a ton will cover about 500 sq ft (as some say 400 sq ft others say 600 sq ft). I believe your unit is a 3 1/2 ton unit. Below is a chart
0sf-750 sf= 1.5 ton
751-1000sf= 2.0 ton
100sf1-1250sf=2.5 ton
1251sf-1500sf=3.0 ton
1501sf-1750sf=3.5 ton
1751sf-2000sf=4.0 ton
2001sf-2500sf=5.0 ton
I would say if you have two units then you are covered, remember the area(region) walls, ceiling and other climate factors will play into your tonnage for you house. The best thing is to consult with a honest and reliable a/c installer in your area. i hope this helped Tim

Hi John, depending on the size, I would need the model number from the outdoor unit if it is a split system, you should have 400 cfm per ton of cooling. If you have a 1600 SQ' home, and a 3 ton unit, 3 x 400 cfm is 1200. It would be to small. There are 12,000 B. T. U.'s of cooling per ton. 2 tons would be 24,000 b t u's. 3 tons would be 36, 000 b.t.u.'s. Also, most contractors put lever dampers in the duct work that can be adjusted. They will put a red flag where the lever is and we can adjust the flow to balance out the house. I don't know where your ducts are, under or above, but with a good light find the crawl space and check it out. Get the model number and call it in to get the tonnage or send it to me and I will tell you. It will have a 024, 030, 036, 042, or, 060 in the number, MODEL number and figure like I told you above, 12,000 per ton. 060 would be a 5 ton. This will let you know if the unit is the right size or not. Please rate me on this and I know you will be kind. Thank you John.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor
PS CFM is cubic feet per Minute.

Hello WESLEY The unit mod# is 3 ton.If the inside part has an 048 number means together it produces 3.5 ton.If inside is 036 it is 3 ton together.If it is a split.If it is a package it is 3 ton.

First off - the 'rule of thumb' is 600' per ton of Air Conditioning. In other words your old unit is a 2 ton unit. So - 2 tons x 600' = 1200'. As you can see if you install the 2.5 ton unit - you will be installing a AC that 'could' cool a 1500 sq ft house (2.5 x 600' =1500 sq ft.). Slightly more than what you need; and the 3.5 ton unit is 'way to big,' (3.5 x 600' = 2100 sq ft.).

Note: fyi - many in the AC business will sometimes refer to tonnage in btu's, i.e. 1 ton = 12000 btu - hence a '2 ton unit' can also be referred to as a 24000 btu unit and vice versa.

So... from the above - you can easily see that "2 tons" of Air conditioning is what is required to cool the 'average' home of 1100 sq ft. "roughly speaking."

Note: it is always best to have a professional 'size' your cooling/heating needs.

One of your questions was could you 'mix tonnage?'

The answer is 'usually you don't mix the tonnage of your outside/inside units.' However, professionals sometimes do (mix the tonnage) in certain situations, and installing a 2.5 ton outside unit with an existing 2 ton inside unit is often done, however, there are some 'tech issues' here and - I would "again" recommend that you call a Service Tech to help you with the sizing/mixing of your cooling/heating needs.

hope this has helped

it is a 4 ton and should cool your home if it is working properly

One ton of cooling per 500 square feet of space assuming you have good insulation. Yes, 4 tons for 2000 feet would be accurate.

Mark is right 5 tons is way too big and you are probably icing up. Even here in Az we size units to no less than 500 sq. ft. per ton and more like 700 sq. ft. per ton. What is the make and model number of your unit? I'm a Goodman Authorized Contractor so I should have most info on hand.