^My thoughts on THIS idea!
Get a Blackened Crest and upgrade it immediately without having to toil around trying to heat up the piece of crap. Seems legit.
Seriously though, the way things are now, people might spend more energy to upgrade their equipment. Wasted heat = increased number of runs in the future = more energy spent = more money in OOO's pockets. Alright so not everyone uses purchased energy to do runs and get heat, but surely someone does, and that person is giving OOO more money when they do it. If that person could save heat from runs, that person wouldn't be spending that CE on running, and therefore that person wouldn't be bringing OOO profit.
Although this seems like a nice feature for players, we need to remember that OOO is a for-profit company that needs to pay its employees. They're already doing for us F2P people by giving us 100 energy a day, and I kind of doubt that they'll do something that has a chance to reduce the amount of cash they take in.
I think your first idea is... Okay. Could have been done better. Not so good. Er... No. Numbers don't go well with Spiral Knights. Like health. Personally, I like heat withought numbers.
For your second idea- I can't tell you how many times it's been suggested. People need to learn to use the search bar. Anyways, this is a bad idea that will never be used. Saving heat to use later? Way too overpowered. It's just not right.
Rating: 12/100