Update note: We fixed the system in late 2019 & will find out if it can get the house cold in 2020.
So our central air died about 2 years ago.
We had it for almost 10 years when it died. The image to the right are the tubes our system, the Spacepak system, used to deliver cool air to the house. Prior to that I used big honking window units. The joy of central air is not having to lug heavy as sin units up the freaking stairs AND down the frigging stairs once a year.
But then we noticed the system wasn’t working that well. Called a well known plumbing/HVAC company to come out and they said the system was leaking coolant and whatever it was the whole system needed replacing because the kind of coolant the system used is being phased out. They brought out a second person to look at the system and got the sales pitch to replace the system, at $12K. To be fair about $3k of that was to hire a crane to replace the unit on the roof.
With that quote, and knowing that most AC systems have a life span of 10 years, that’s $1,200 a year (not including power, filters, and maintenance) for the privilege of central air. For that price I could get someone from Taskrabbit or something like it to come to my house and bring the various ac window units up and down for way less. Hell for that price, I could buy new ac units every friggin year and pay someone to lug them up and down. Also our house is small, and the bedrooms, kitchen and living/dining space is less than 800 sq feet (not counting baths and hall). We don’t need a super system. So not going to replace the system this year, not at that price. Besides, we replaced the roof last month, so that was our big capital project of 2018.
The Spacepak system, when it was running, I really loved it. There were no bulky vent structures and the vents in the ceiling kinda blended in. When the system was on, everywhere, except our bedroom was fairly quiet. Above our bedroom there was a lot of the mechanicals. We never never had the system below 75F, I hate the cold. I continued to love the system until it died.
It did have it’s faults. The kitchen vent was above a cabinet and I don’t think any air really got in there. As a consequence, I avoided using the oven in the summer. I have my doubts we could have gotten the house ice cold with the system. It, like our heating system, took its sweet time getting to the temperature we set.
I don’t believe the people who quoted us were familiar with small duct high velocity systems, and the price tag was probably for a whole new bulky duct system. We did contact another company that did have some familiarity and after the technician came by they never got back in touch with us, and I didn’t follow up. So alas we are doing window units.
I am playing with the idea of scrapping the system for mini-splits. I have a tiny house (not on wheels, just a tiny townhome) that I put mini-splits in, one unit for each floor. It does heating and cooling. Since the house was ridiculously tiny, I used images of Honk Kong apartments as inspiration and noticed these mini-split systems all over the place. The major downside is appearance, but I’d want one in the kitchen just to deal with the fact that it is the hottest room in the house in summer.