Sensibo Sky - Overview and Impressions
I bought a
Sensibo Sky last week in order to run some automation tests. To give some background, I have a large two-story home with my office on the second floor in the NE corner. There isn't much air pressure coming from the central air ducts and since my servers, PCs, and network equipment is in there, the room can get to 85+ during the summer even with central air running. A few years ago, I bought a Honeywell portable AC unit for the room and had a clear polycarbonate window with the vent cutouts made so I could install it (I have casement windows, so the typical window kit included with portable ACs won't work).
Anyway, I had tried to control this air conditioner with my Logitech Harmony hub, which I have integrated with SmartThings. It did work, but there some disadvantages to how I implemented it:
1. Harmony can only run one activity at a time. So if I wanted to watch TV in my office, the TV activity would turn the AC activity off when activated. I don't believe you can do device-level (i.e., no activity) control through SmartThings though you can with the Harmony software. However, I need ST integration so this quickly became an issue.
2. There was an issue with turning the AC off - it wouldn't turn the AC off consistently. I thought it might have been an issue with the Harmony's config for the Honeywell AC, but as I later found out, it wasn't.
So, I saw the Sensibo Sky on sale for $119 and bought it. There are cheaper ways I could have done this (using a Remotec ZXT-120, a Broadlink IR unit, or even another Harmony hub dedicated to the AC), but I decided to try Sensibo since it is dedicated to air conditioners and has a SmartThings integration. The app is also pretty cool if I ever decide I need to use it. Here is what I found:
1. The Sensibo unit integrates nicely with SmartThings. The smartapp and device handler are available in the community.
2. The native app is a bit confusing and hard to find things at first, but it has a lot of nice options (timers, temperature settings, etc). Basically, it can be a standalone thermostat for any IR-controlled AC even without a smart home hub.
3. The problem I mentioned with the Harmony not consistently turning the AC off? Yeah, Sensibo had the exact same problem. What appears to be happening to me is that the AC control panel "goes to sleep" after a certain amount of time. Once it goes to sleep, the initial "off" command seems to wake the control panel and then the next power toggle turns it off.
I'm guessing that Honeywell's actual remote must be sending a wake command every time because it ALWAYS works. So because this integrates well with SmartThings, I came up with a great solution to fix the issue using webCoRE:
1. I created a virtual on/off button in SmartThings called Honeywell Power.
2. In webCoRE, I created a piston (i.e., a program) which monitors the state of the button:
ON: When the button changes to ON, the program makes sure the window is open for venting, checks the power value on the AC's energy monitor switch, and turns it on if all conditions are met.
OFF: When the button changes to OFF, the program sends a "lowercoolsetpoint" and then a "raisecoolsetpoint" to the AC. This wakes the control panel and doesn't actually permanently change the set point. After a 1 second delay, the OFF command is sent and the AC turns off.
So, I now have everything running the way I want. Am I going to keep the Sensibo Sky? I think I will keep it and I'd definitely recommend it if you need a "thermostat" for your portable AC. However, there are probably cheaper ways to do this if you have a smart hub so that is something to consider.