I recently had 2 Mitsubishi minisplits installed into my 5 year old 2 storey home and I'm hoping to get an answer to a few questions. First off, let me state that I have very little background in this area so my questions may seem pretty novice...and quite long winded as I have multiple questions. We live in Nova Scotia, Canada.
Main floor - open concept - 900 square feet; 3 sections that form a circle of sorts...back two spots are main living space and kitchen and front space is sitting area (front door is located here and so are stairs leading to upstairs). Have GE18NA Mitsubishi minisplit on outside wall in back spaces between kitchen and main living space which is intended to heat the downstairs. We expected the front space to be slightly cooler since the hot air has to travel further.
Upstairs - once you reach the top of the stairs to the right is an office space above a garage...we leave that door closed as it's quite cool and we don't use that room often. To the left are 3 bedrooms. A second mini split is installed in the master bedroom...FE12NA... Total upstairs is roughly another 900 square feet, but if you take the office space out of the formula it's closer to 600 or so.
Onto my concerns:
Both units continuously blow "cool" air 24/7...even though it feels cool to me I"m sure there is some heat in there and it's primary function is to circulate the air. Is that correct?
However, when they really start to put out heat the vanes go down and the units push out hot air for about 2 minutes and then the vanes go back up and the regular fan starts blowing again. I'm not sure if this is how most minisplits work, but this what mine does. Unless it's morning and then the vanes stay down much longer as more heat is required for a longer period.
1.The upstairs unit does this once every 10-15 minutes or so (blast of heat), but the downstairs unit does this every 5-6 minutes. Is this okay or is this abnormal in reference to the downstairs unit running twice as often? When I bought them I pictured them cutting in and out every 20 minutes or so and running for longer periods, but since I know nothing about them then maybe this is perfectly normal! I at least expected them to cut in and out equally so this is where my confusion lies since they seem to be doing different things. When I try and search online I can find problems with the units running constantly because it's too cold outside so the back up source needs to be turned on, but I can't seem to find an answer to my situation (which again makes me think that there's no problem). I guess I don't understand why one head might work twice as hard as the other...other than plain old thermodynamics and that I'm losing some of my heat upstairs and the internal thermostat on the machine downstairs isn't satisfied as long as the one in our master bedroom. The rooms do reach my set temps and maintain the constant temp so there is definitely heat being circulated, but it seems that the downstairs unit has to work "harder" to maintain it. Is there any risk to the outdoor units since it puts out the shot of heat every 5 minutes? These are variable speed compressors so is it okay that they do this? Or does something just seem plain wrong. Is there something I should change in terms of set up?
2. What is the best way to utilize my minisplits? Should I turn the one down downstairs at night when I go to bed since we don't use the downstairs or do you leave it running at 20C (68F)? What about in the daytime (do I leave the upstairs one set at 20C when we wake up or turn it back)?
3. Do I leave my back up heat source turned way back (unless necessary on really cold days) and just heat with the minisplit or do I set it to the same temperature as the minisplit?
I'm sorry for the longwinded question everyone. If I've left pertinent info out please let me know and I certainly appreciate any advice/reassurance.
Thanks so much!