trying to find out the tons

[sanchez99]

i have a 28 yr old lennox ac & furance unit how do i tell the tons on the ac unit. the model no.# & serial no.# are faded off the ac unit. is there a difference in a 2.5 ton & 3 ton unit in cooling.

[BigJon3475]

6000 BTU difference.....12000 btu for each ton. You dont have any paperwork with the units?

[Mr Bill]

i have a 28 yr old lennox ac & furance unit how do i tell the tons on the ac unit. the model no.# & serial no.# are faded off the ac unit. is there a difference in a 2.5 ton & 3 ton unit in cooling.

You need the model# for tonnage, or the numbers off the top of the compressor will help.

[coolwhip]

Yep...if you know the size of the unit, you can purchase one on line and you and your neighbor can install it.:eek:

[sanchez99]

i don't have the model number for the ac unit. the numbers are faded from being outside for 28 years. my furance is 110000 btu & it say's bonnet cap. 88000 btu.

[sanchez99]

one more ?. will a 3 ton 13.50 seer unit cool a house better than a 2.5 ton 13 seer unit

[BigJon3475]

No matching is critical to performace and SEER ratings. And you have a 110,000 BTU furnace?? You have a 9.16 ton furnace ummm....So you should call a estimator out to look at getting a new system.

[Mr Bill]

No and you have a 100,000 BTU furnace?? You have a 8 ton furnace.http://i99.photobucket.com/albums/l286/mrbillpro/icon_haha.gif

[ItshotinBama]

one more ?. will a 3 ton 13.50 seer unit cool a house better than a 2.5 ton 13 seer unit

You're heading in the right direction. You don't need to know the tonnage of your 28 yr old unit. It's time to replace that dinosaur.

To answer your question, they will both cool equally when properly installed on the proper home. Find a company that will do a load calc to determine what your home needs. The size of your previous unit is irrelevant. If a company wants to give you an estimate based on your old unit, move on to the next company.

[d_griff]

Yep...if you know the size of the unit, you can purchase one on line and you and your neighbor can install it.:eek:

oh thats great..i loled

a 3 ton will cool to fast if it is oversized and it will short cycle and not remove the humidity correctly and it will feel clammy and uncomfortable even though the stat is satisfied
and what is a 8 ton furnace???:confused:
i heard of 100,000 btu furnaces having a 3 ton blower or so.

[BigJon3475]

Woops did I say that outloud...LOL Tons are used to decribe A/C it is the amount of heat it takes to melt one ton of ice @ 32 degree F in 24 hours 288,000 BTU/24 hours, 12,000BTU/HR or 200BTU/Min.....I guess I should write that 100 times now huh?

[BigJon3475]

http://i99.photobucket.com/albums/l286/mrbillpro/icon_haha.gif

If you don't mind Id rather be corrected than laughed @ but I'm glad I could be here to amuse you.

[d_griff]

Woops did I say that outloud...LOL Tons are used to decribe A/C it is the amount of heat it takes to melt one ton of ice @ 32 degree F in 24 hours 288,000 BTU/24 hours, 12,000BTU/HR or 200BTU/Min.....I guess I should write that 100 times now huh?

a btu is the amount of heat it takes to heat one pound of water one degree at 72 degree sea leavel..or also equivelant to one matchstick.

[Mr Bill]

If you don't mind Id rather be corrected than laughed @ but I'm glad I could be here to amuse you.

I don't mind at all, but you can bet everyone else was laughing also I was the only one to have the B@lls to post my real impression of your answer. :D

but I'm glad I could be here to amuse you

I am glad also I needed that thank you very much.

[sanchez99]

ok one more ?. my house is 2 story twin ranch. which will cool better a 2.5 ton carrier or a 3 ton trane.thanks for all of your help.just trying to do some research don't know jack about hvac:D

[Mr Bill]

ok one more ?. my house is 2 story twin ranch. which will cool better a 2.5 ton carrier or a 3 ton trane.thank for all of your help.just trying to do some research don't know jack about hvac:D

Personally I would say a 2.5 ton RUUD would.

[d_griff]

ok one more ?. my house is 2 story twin ranch. which will cool better a 2.5 ton carrier or a 3 ton trane.thank for all of your help.just trying to do some research don't know jack about hvac:D

you need square footage and more..who is jack??

[Mr Bill]

you need square footage and more..who is jack??

Jack is Jake Leggs cousin.

[sanchez99]

you know who jack is:eek:

[BigJon3475]

I don't mind at all, but you can bet everyone else was laughing also I was the only one to have the B@lls to post my real impression of your answer. :D

but I'm glad I could be here to amuse you

I am glad also I needed that thank you very much.

Its fine humility makes me a better person. Thats a great answer coming from a holy man like yourself. Thank you.

[d_griff]

Jack is Jake Leggs cousin.

jake legg is my cousin..i didnt know jack was my cousin..jake leggs:confused:

[BigJon3475]

I didn't know very much about HVAC when I worked on a property with furnaces just how to trouble shoot electrical. Most of what I have learned now is on a heat pump property. I am learning and as I said before several times in other post I am fairly new to the whole industry. And since I'm still in school for it I would think helping people before laughing at them would be a better choice. If you laugh great I'm sure you never made a mistake before.

[Mr Bill]

Its fine humility makes me a better person. Thats a great answer coming from a holy man like yourself. Thank you.


Please don't get "Holy" man and "Perfect" man mixed up I like you, are still work in progress.

[sanchez99]

sq footage is 1,200

[BigJon3475]

a btu is the amount of heat it takes to heat one pound of water one degree at 72 degree sea leavel..or also equivelant to one matchstick.

My definition doesn't have anything to do with 72 degree?? heres my def.

"The amount (quanity) of heat required to raise the temp. of 1 lb of water 1 degree F."

Just curious.

[BigJon3475]

Please don't get "Holy" man and "Perfect" man mixed up I like you, are still work in progress.

Maybe I took your post in the wrong manner my apologies. I did make a mistake and your laughing made it apparent for me to look that up and correct myself. Thanks.

[Mr Bill]

Maybe I took your post in the wrong manner my apologies. I did make a mistake and your laughing made it apparent for me to look that up and correct myself. Thanks.


No problem buddy you should sign up for the Pro tech forum if your in the business there is a ton of good info over there.

http://hvac-talk.com/vbb/showthread.php?threadid=116113

[d_griff]

My definition doesn't have anything to do with 72 degree?? heres my def.

"The amount (quanity) of heat required to raise the temp. of 1 lb of water 1 degree F."

Just curious.

well if you are in a colder climate,or not at seas level your factors change,noe really improtant but it is relevant,if you go to the top of the mountains at 20 degrees it would change

[BigJon3475]

well if you are in a colder climate,or not at seas level your factors change,noe really improtant but it is relevant,if you go to the top of the mountains at 20 degrees it would change

Okay all my def's are at standard conditions. I see what ya mean now.

[BigJon3475]

No problem buddy you should sign up for the Pro tech forum if your in the business there is a ton of good info over there.

http://hvac-talk.com/vbb/showthread.php?threadid=116113

Well technically I am only working on HVAC the right way (or atleast trying to) for about 6 months now. Before the preferred method of charging was....hold hand on suction side till its cold.....lol....I laughed at that one to when I found out the proper way. I was actually told to do it that way by a HVAC Tech that had his own business and what's worse it was his A/C he showed that to me on. Im 28 and hoping to do things the right way from now on I guess thats why I took the constructive criticism the wrong way. I wouldn't consider myself a pro and I'm not sure I meet the requirements to be on the pro tech forum but I will give it a shot thanks again.

[d_griff]

Well technically I am only working on HVAC the right way (or atleast trying to) for about 6 months now. Before the preferred method of charging was....hold hand on suction side till its cold.....lol....I laughed at that one to when I found out the proper way. I was actually told to do it that way by a HVAC Tech that had his own business and what's worse it was his A/C he showed that to me on. Im 28 and hoping to do things the right way from now on I guess thats why I took the constructive criticism the wrong way. I wouldn't consider myself a pro and I'm not sure I meet the requirements to be on the pro tech forum but I will give it a shot thanks again.

ha thats how i was told at my first job,hold that bigger line till it gets beer can cold..he owned the company..hacks.

[BigJon3475]

"hold that bigger line till it gets beer can cold"

I guess thats the first indicator. I still work with so called a/c prof that think you charge using liquid straight into the suction side till it freezes up and goes away. I tried to explain they look at me like I got 20 years buddy you got what?

[d_griff]

"hold that bigger line till it gets beer can cold"

I guess thats the first indicator. I still work with so called a/c prof that think you charge using liquid straight into the suction side till it freezes up and goes away. I tried to explain they look at me like I got 20 years buddy you got what?

some real hacks,liquid is good for valves:eek:

[pstu]

sq footage is 1,200

Your question is very basic, and it really sounds like you under-estimate the know-how needed to successfully do AC sizing and installation. I will treat your question as if you really mean everything you say (some jokers post questions for a laugh). A really primitive method of sizing is sqft/ton. But that ignores important things such as house facing North or West, lots of windows or hardly any, lots of insulation or hardly any, and the airtightness of the house. There is NO WAY a single sqft/ton answer can be correct for all the variations of these things. Very few houses are totally average. You wanna tell us what part of the country you are in? It matters a lot.

I strongly recommend you get a bit of AC education and then hand the job over to an HVAC pro you can trust. Read this please, for a start:

http://resourcecenter.pnl.gov/cocoon/morf/ResourceCenter/article/136

http://www.energystar.gov/index.cfm?c=home_improvement.hm_improvement_hpwes

Another warning is, your duct system may be robbing your central AC and heat of its energy, if it leaks like so many do. If you put on a larger AC willy-nilly then you might have your fan working against too much back pressure, it will be inefficient and may fail prematurely.

Hope this helps -- Pstu