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I have a Carrier whole house Air Conditioner I want to replace. It is model 38EN048320. @ things: 1. What "ton" is that AC rated at? It's so old I can't find what size it is so hard to pick a replacement. 2. With todays models they are all high efficency, should I get the same size replacement or can you step down a notch based on the efficency in models made today? I know a contractor would figure this all out but I'm doing this job myself as I have done this before.

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  • thector May 26, 2010

    thank u

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1. 3 Ton Up To 4 Ton 
2. You should get the same size - high efficiency means that for the same heat extracted from the residence the unit consumes less electricity than an older one. How much less is explained in the ratings: if your present unit could be rated at G the new ones are rated at between C (for simpler and cheaper ones) to A (the best and most expensive ones).
If you live in the south then the high price of an A rated unit is worth paying - you will recoup the difference to a C unit in less than 5 years(or even faster if you shop around) from the savings on the electricity bill.

Posted on May 26, 2010

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1 Answer

My landlord installed this brand new out of the box. Our apt is 900 sq ft tops. This unit can't even cool down our living room and kitchen. If the whole 2 bedroom apt is 900 sq ft, you can imagine how...


The AC your landlord installed is rated at 8000 btu which is way too small for 900 sq ft. You need at least a 15000 Btu Air conditioner and a 'well insulated' house to be cool.
A good rule of thumb in the AC business says you need 1 ton (12000 btu) of Air conditioning for every 600 sq feet (if the house is well insulated) - if not - then you will need 1 ton (12000 btu) for every 400 sq feet.
So, if you have 900 sq feet and the house is well insulated you should have at least a 15000 btu unit.
If it's not well insulated you will need 24,000 btu.

Jun 07, 2011 | Maytag M6X08F2D Air Conditioner

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What tonnage is my new Carrier A/C model # 24ABC642A300 and how many sears is it?


The AC unit you inquired about is 3.5 ton unit. With a 10 seer rating.

Hope this information helps.

Mar 01, 2011 | Carrier 38CKC042 Air Conditioner

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Hi: I have a Carrier 38CMC42300 AC unit which will not turn on and the air handler is blowing hot air. The 40 amp breaker for the AC unit trips right away when reset. Could this be a condenser or motor...


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heatman101

Sep 30, 2010 | Carrier 38CKC036 Air Conditioner

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Can I mix brands/tons when installing AC unit to existing coils?


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

Jun 20, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

What ton is my AC unit?


2 and 1/2 ton.Adequate for 1000-1250 sq. ft.

Jul 22, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

Air conditioner replacement--new size required?


567C024RCU In this model number is the # 24. That stands for 24,000 btu's. This is a two (2) ton unit. Has this two ton unit cooled ok in the past? if so replace with the same size. But make sure yo change the indoor coil to match the size "and" efficiancy of the ew unit.

Apr 14, 2009 | Carrier 38CKC042 Air Conditioner

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