I don't go about decor with warm or cool in mind, more with the space in mind and the related spaces. I lean towards warm, with a deep love of gold, burgundy, copper, etc, but will also toss in a cool colored room if it flows. I am currently thinking about how to do this victorian...and I'll probably do the majority of it in pretty warm colors taking a clue from the original draperies that exist (gold, green and copper) and to compliment the wood (i don't love wood with cool colors). But I think up in the servents quarters I'm going to go ahead and embrace my cool side. The rooms are darker than the rest of the house, and being former attic overlooking gardens and the bay, I think they call for softer cool tones in silvery gray and soft yellows maybe even a lovely soft blue or silvery green (no hospital green or peach LOL YUCK...this is because we were patients verses staff Vamp...I betcha no patient loves hospital green LOL) I just have to make this flow from the gold walls of the hall...it will be a fun challenge, and I'm bringing in a pro so I don't screw it up LOL

We have a fairly large bedroom and we both consider it very cozy. I think cozy is not really a matter of size, but how the space is furnished. If there are comfortable places to sit, to read, to put one's feet up, to write a note or check email when you don't want to go to your office, to step outside to enjoy the weather in a comfortable chair--- to me, this evokes a comfortable, safe feeling that is the epitome of "cozy." With respect to guest rooms, now that our children are out of the house we have several :) One is a large room with a double bed, a club chair and ottoman, a desk, dressing room and spacious bath. It is off by itself and has its own HVAC zone, so we usually put people there. The other two rooms have two twin beds and one single bed, respectively. We find that this configuration lends itself to a versatile combination of sleeping arrangements. The only thing I would change is to put a double in the room that holds one twin. But since my ,other is the one who uses that room most often and finds the bed very comfortable, we haven't bothered. And since we also have beds downstairs, they're not the only options. IMO it should not be considered a hardship for a married couple to sleep in twin beds for a few nights. In fact, I find the concern about it sort of odd. After all, it's only a few nights out of years.....right?

I am with hubby. I would not want a window-shaker in the bedroom if there is any other way. You have a premium system with the ground source heat pump. Running a window unit might cost more to operate than overcooling the rest of the house. A ceiling fan might be counterproductive. You might be better off letting hot air stratify near the ceiling. High wall mount mini splits don't have to be on outside walls if you can find a way to deal with the condensate. I have 6 on interior walls and the seventh on the outside wall has its plumbing run in the stud space, not directly to the outside. You could also install a small AHU in the top of a closet or in adjacent space. Before jumping into a mini split, do make sure that your system supply and return ducts to the MBr are operating properly. Modifications to your primo GSHP system probably makes more sense than adding. Larger ducts would do it if possible. In addition to that, let's paint with a big brush and see if another zone can be added. Ask around and get recommendations for excellent HVAC pros in your area and then get them in to look at it. On the other hand, a MSHP would be very easy to operate with a small back up generator. That room might be a nice oasis in times of power outage.

..to your question about eggplant and green..I vaguely remembered I saw this combo somewhere..now I've stumbled upon this pic again: as you can see the green is totally different from yours-it's deeper color of the same intensity as the eggplant. I'd probably call it chartreuse? Easier to pull off. But not only because of the similar intensity-mostly because it's a tiny space with lots of openings, so the accent wall reads less like an accent wall..it looks like a build in (which it partially is), and has a sense of purpose about it. Which it might not have if being just one of the walls in otherwise differently painted room. Some people can pull off absolutely everything; I for example don't consider myself being one of these lucky people lol, so I'd be hesitant to do an accent wall, unless: -architecture or shape of the room supports it somehow -it makes sense for bringing attention to a certain element (an opening between two parts of one bigger open room, a niche, etc) -it's close in color to the main color. just a bit deeper for example -it's wallpaper that ties all the colors together including the main wall color. somehow it's subtler thus easier to pull off. well, and because I have a soft spot for wallpaper)) Again, there's not like it's right or wrong. It's more on the easier-harder scale..at least to me. Now as for the ceiling..interestingly, I somehow see this happening more than I see an accent wall. I can't explain it to myself yet..)) Just a feeling. But I think you need to consider many many things if going for it. Ceiling height, floor color..whatnot..