[SWHouston]

I know, it's a real hassle keeping the little ones the temperature they like.

Personally, I clip my two rather short through the Summer months. I don't really show them, and I take them out along a Bayou and they jump in frequently, so, the shorter coat is better for "us".

I have a doggy door, and they run in and out many times a day. I have seen them rush out, and lay paws up in 100 degree weather, just to warm up from the A/C inside. And, I really don't keep it all that cool in the house.

So all in all, my two are rather cold natured, and don't mind "warming" up at all. It's possible that a long coat may exacerbate them overheating, but, I doubt since you keep them inside, that will be a problem.

What you might do, if you really want them with long coats is...
Go ahead and let the hair on their backs and all grow out, but, clip/shave their chest through their privates (under-body) very short. That'll give them a open area that they can press against the Floor Tile or Grass, to get instant cooling, and it will be out of sight (underneath them).