Replacing A/C heating system advice needed
We have a 2500 sq ft two story home in Austin that is 18 years old with the original A/C and heating units for the downstairs and upstairs. Since we are empty nesters we rarely use the upstairs and either keep the a/c off in the summer or set 6 degrees higher than the downstairs. (downstairs set at 80)
Our downstairs trane unit needs to be replaced and we have gotten some quotes. We have had no problems with the upstairs unit. Two contractors recommended replacing both units at the same time because of their age. One recommended trane and the other recommended lenox. The third contractor recommended only replacing the downstairs unit until the upstairs unit goes out.
We don't really know what is best. Is it usually cheaper to replace both at the same time instead of later paying for the other unit? Also, in googling I can't find any information about whether trane or lenox is the best.
Any information will be greatly appreciated. Thank you.