I had an ACS solar system installed with my pool about 6 years ago. We hit 9 degree’s a few winters ago(5) and a leak developed. ACS came out and fixed the leak. Their service has been great. Here is an example of solar temps«I gained«12 degree’s» an «hour» in my «SPA» yesterday using my ACS system(4−6−14). The temps were as follows: outside temp 65 degrees, the pool temp was 56 degrees before activating solar at 10:00 am. By 1:30(with the outside temp being 76 degrees) my spa was at 96 degrees using nothing but solar heat In the summer on a hot day I can gain 8 degrees in my «pool» easily. but I can also lose 6 degrees at night easily. If I were to use a pool cover I could retain almost 80% of my heat gains. Propane was $ 4.49 this year(ouch) it was so nice not to have to use propane to heat my spa. Update: 5−7−14 I have received a bill for $ 95.00(almost a month later???) I am currently waiting for Ann to return my call. Their Techs were very nice people, top notch. But management needs to brush up on their communication skills. I had to contact Corporate to have a matter settled. Also on a finer note. When my pool was built the owner of ACS tried to charge me an extra 10% because it took so long to build my pool 2+ years and that prices had gone up. I guess my 5K in his bank account for 2+ years was over looked. He did not want to honor our contract, which is «not» the way to do business. Update(3−22−16): they are a local company, and I hope their customer service has improved. and I have cooled off. A.V. needs businesses like this one… although I do my own repairs on my solar system(when the time comes). Also their cost to winterize a solar system is pricey. but they do have overhead, the techs are«great» people.