Should I replace AC coil when replace gas furnace?
I need to replace a gas furnace. At least two contractors suggest me to replace AC coil since it is cheaper to do now, they said. The central AC works fine, and it is about 18 years old (the same age as house). The two contractors are in heating and AC business. Another contractor does not mention it and he is in plumbing and heating business. My question is: is it worth to do it now?