You might be talking more about the spacing itself but... Don't hire a handyman...posterboard or newspaper is your friend! Measure and cut out all your sizes, use painters tape to move them around until you get them just how you want it. Mark your pencil hole right on the paper and hammer through. You can even push the nail through just enough to make a slight dent in the wall and then remove the paper to add the nail if you want. I make mock ups of everything. My walls would look like swiss cheese if I didn't!

it is unlikely you are going to solve your problem on a forum like this...unless you are trained in electric and HVAC, best advice is to call an established reputable HVAC dealer to fix your issue, especially with low 40 temps inside your home. When I see threads like this, I always ask when was a routine PM last performed on your system. Anything mechanical has to be properly maintained. Breakdowns do occur, sometime they can be avoided with regular service especially with a system that is old. IMO

butterflyjlv : thanks for the thank you. Here is another possible option for microwave cabinet on right of window side. above walls: 30 wide (42" high) below bases: 15 drawer then 2 ( 30 w bases) If this is the only cabinets in the kitchen, I highly suggest going to 42" tall with no crown to get an extra storage : 1 extra shelf per cabinet. Also under lighting really is functional as well. Here is a photo example how 42" white shaker look with no crown. I agree with yvonnecmartin (cookie sheet somewhere is useful) Don't forget fillers on adjacent side walls, they're functional,too. Hope that helps :)

A range top with an oven below is possible and you would need a cabinet but presumably you could get a cabinetmaker to do a matching one. This look is very trendy but I personally don't understand it - aside from aesthetics. The oven in almost all instances is placed lower than a standard range and there doesn't seem to be any increase in functionality for the trade off but it looks sleeker than a stove which is why people with limited space kitchens will do it. I have never seen it done where there is the ability to actually have a wall oven at a comfortable height. People who switch from gas to induction are generally quite happy after adjusting and there are real benefits to induction versus gas. One benefit is that if you are using a down draft, an induction doesn't need as much venting capability as a gas would. Of course what you cook is going to impact venting needs as well.