Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 8/15/2016

How long to replace a AC evaporator coil? Easy access in garage. Ac unit right behind unit out side the wall.

4 ton Goodman 21 in.coil. Same size unit only new coil will handle old and r22 freon. Ac unit right behind coil unit out side the wall.

Do you have the same question? Follow this Question

1 Answer


You say "same size unit only new coil will handle old and r22 Freon" - not sure what you mean there. The coil has to match the system to work right, and has to be rated for the pressure - so if an old unit sometimes you can, sometimes you can't get a compatible coil, and can end up being forced into buying a whole new unit instead.

With rare exceptions, you cannot run an R-22 coil on R-410a (the common current refrigerant till the EPA also phases it out in a few years) because the pressure is a lot higher - plus if you replace the whole outside unit with new you HAVE to connect it to a coil that it is rated with - and VERY few are rated with more than none coil model, so if whole outside unit needs replacement basically you are putting in a new evaporator (indoor) coil too. Trying to run an existing R-22 coil on the "same size unit" say 4 tons in your case, almost certainly will not work anyway, because the heat transdfear efficiency of R-410a is substantially less than R-22, so for the same cooling capacity while the same tonnage unit will remove the same amount of heat, the coil is going to have to be either a lot more efficient, move a lot more refrigerant and air through and past it, or be bigger in cooling surface area than with the R-22 system.

Lots of prior questions with answers on this issue, R-22 replacement gases, the economics and decision process of fixing a leaking evaporator coil (for $1000-2000 commonly) versus putting in a new unit, etc can be found in the Home > HVAC link in Browse Projects, at lower left.

Anyway - excluding any delivery time if a coil has to be ordered rather than in-stock or picked up/delivered by at an in-town distributor, probably no less than 2 hours to do the actual changeout and commonly up to about 4 in more difficult cases or if he has to look at it first then go to shop/distributor to get parts to match.

Answered 4 years ago by LCD

Related Questions

Terms Of Use
Privacy Policy