Hello, Could someone please help me with the problem with my 10 yrs old Trane AC unit. Air handler model: Trane 4TTB3036A1000AA Problem symptoms: One day ago the air handler started making a sound like fan or motor starts, tries to speed up for 1-2 sec, then shuts off, then waits few seconds and tries again, and so on. The fan on the compressor unit (outside) turns on and off at the same frequency. I ordered a new capacitor and switched out the capacitor. The unit still cycles on and off every few seconds. The unit was completely off for one full day while I was waiting for the capacitor to arrive. It is also currently off now since the new capacitor did not resolve the problem. Are there any common easy to fix problems with such symptoms? Or should I just call an AC tech? Thank you.

Hello All, Looking to install a central AC unit for the first time. 2.5 year old house, ~2800 sq ft. I've called a lot of contractors and they've all recommended either 2.5 or 3 ton size for my AC (based on the 1 ton per 1000 sq ft rule). Have decided to go with 3 ton size and chosen a contractor to do the install. We also have a Lennox furnace (63000 BTUH output, 66000 BTUH input) that the builder originally installed. He has three quotes: Carrier 24ACC6 - $3500 [URL]https://www.carrier.com/residential/en/ca/products/air-conditioners/24acc6/[/URL] He said he'd include a Carrier cased coil with this price even though it's normally $100 more. I thought cased coils had become common for evaporator coils but anyway. Lennox 14ACX - $2650 [URL]https://www.lennox.com/products/heating-cooling/air-conditioners/14acx[/URL] Goodman GSX16 - $2925 (can maybe drop another $100) [URL]https://www.goodmanmfg.com/products/air-conditioners/16-seer-gsx16[/URL] All come with 10 years parts and 2 years labour warranty. It's the same contractor installing either one of these units so do you guys have any recommendation on which unit I should go with? Much appreciated.