The ductless system would be great, but they cost $$$ to buy and install. If you're not using the room frequently, your payback on the ductless system won't be worth it. The space heater you describe would do a fine job as long as you remembered to t...
Yes it is ok. Color care shampoos and conditioners just add extra moisture for hair that has been damaged by color. Just be careful because some shampoos and conditioners, such as ones made by Redkin has tint in them, Otherwise, wash away.
Yes it will work and it will not cause bubbles:- because hair & fabric conditioners are both oil based and will kill foam. Don't use too much because fabric conditioners contain approx 2-4% actives (& over 90% water) and Hair conditioners are approx ...