Air Conditioning - Is 35 feet line too long?

Hi guys,

Can someone confirm that 35 feet line from outside unit to the inside coils is too long?

We had a new home and installer came in to survey the property told us the place we are suggesting is 35-40 feet away from the inside unit- the coil sits on top of the furnance. He said if he does install that long of a line it will create problems for us. such as air noise and mostly likely poor cooling.:mad:

Can some expert confirm that for me? :(

Thanks in advance.

35 feet is a fair distance but it most certainly is dooable.
Your installer must however pay close attention to properly sizing the line for a minimum pressure drop and good oil return.

In commercial circles 35 feet is nothing.

Let us know what size a/c you will be installing, whether the cooling coil will be above or below the outdoor unit and how much higher or lower it will be.

35 to 40 is not too long. As long as the piping is sized properly you will not have any problems. Equipment manufacturers specify in their installation manuals what pipe sizes to use at certain lengths. That can vary somewhat according to the manufacturer. Check with your installer and they can verify exactly how long the line set can be for the brand that is being installed. It is not uncommon for a line set to be over 40 ft.

Thanks for your input guys. Let me give you little more detaild of our home. Our home is about 2000sf in size with a basement where High efficiency carrier furnace is installed.

The AC unit is 13 SEER 2 ton made by Keeprite with 2 speed fan. At first installer said 35-40 feet line is OK but I have pay $10.00/pfeet more after 20 feet line. But when he came to servey our home then he said distance is little too long.

I think the total distance is about 37 feet from outside unit which is on higher and line goes down into the basement to coil which will sit on top of the furnace.

I hope I have provided enough details for you gurus to make your suggestions. Please advise or I will go with the close spot where wife and I both hate which is the very front of our home.:wall:

Im with GregH and safemoney That the lines can go that far. Most say up to 50 ft. But I think what we have here is the cost of the copper lines are out of this world now and he is just try to save money for himself on your job.

ED;)

He said if he does install that long of a line it will create problems for us. such as air noise and mostly likely poor cooling.:mad:

Can some expert confirm that for me? :(

Thanks in advance.
How can the length of the line set create air noise?
We routinely run 40-50' sizing our lineset properly.

I would suspect the installer would mention "air noise" after having experience installing undersized liquid lines.
If too small the refrigerant could flash in the liquid line causing that kind of noise.

I have the same question for a heat pump. (American Standard Heritage 12 model 2A6H2036A1000A. 36,000 btu with ADP "A" coil model HA54243A170A000490) that is replacing a 3 ton AC unit. These have 7/8" suction and 3/8" liquid connections. Is it OK to use a 7/8" X 3/8" lineset for this distance?

sdilley
These have 7/8" suction and 3/8" liquid connections. Is it OK to use a 7/8" X 3/8" lineset for this distance? A heat pump is just the same as a AC unit. It is always best to just check what the unit calls for. Id say they are ok

ED

Ed - Thanks for the reply! It sure is comforting to get get professional assurance on things like this.