About 10 years ago my AC failed. Decided it was time to replace both my units including the air handler. Bought the equipment online from Alpine Air and it arrived in a few days. Then I put an ad on Craigslist for a AC installation. Paid $1000 for each unit to be installed. Watched a bunch of YouTube videos to learn what “good” looked like, and just watched over the guys shoulder the whole time, asking him questions about how he was measuring the vacuum etc. Saved around $10k compared to the quotes I’d received from Home Depot and Lowe’s. Would do it again.