Maybe someone can explain how I got three different quotes on which size system. Background in Dallas Texas, 2800 square foot 1 story house with 10 foot ceilings and lots of windows facing north and south. My equipment right now is 10 year goodman with a 3 ton and 2 ton system.
1) Quote 1 from a trane authorized rep go with a 4 ton and 3 ton xl20i
2) quote 2 from another authorized rep go with a 3 ton and 2 ton xl20i
3) quote 3 from independent go with two 3 ton and Lennox XC21 which was 30% percent cheaper than tranes.
They all measured and took about 1 hour to do the calc. Funny thing nobody had a computer they all did it on paper but did not show me their report.
Any suggestions would be appreciated. I am also willing to buy the software myself and attempt to do the calculations.
Quote one sounds like he is just using a rule of thumb, 400 sq ft per ton.
Either of the other 2 could be correct.
You may want to buy the software and do your own.
you need to also take into consideration that different units have different ratings. A 3 ton Trane may not have enough latent capacity than a 3 ton Rheem (as an example only) so a Trane may need to be upsized.
I doubt you would have to increase 1 ton in size.
Originally Posted by Gunslinger
I forgot to mention that the first trane rep calculated the load to be little over 3 1/2 ton and 2 1/2 ton but he said since trane did not make the 1/2 ton units he average up on both units. Another question is the Trane xl20i that much better then the Lennox XC21to justify the cost? It looks like the clean effects unit on the Trane really adds quite a bit to the cost which may or not be worth it. Also I am looking at the extra electronics on the trane. Would those be covered under a warrenty? Knowing how much a it cost to replace a board on a TV around 400, I shudder how much trane would be charging to replace their electronics.
If the current sized units are cooling the house.
You don't need to have each of them increased by 1 ton.
The boards are covered under warranty.