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I don’t think you really grasp how much pressure 10,000 psi is.
A typical car tire is like 35 psi
A propane tank for a grill is like 200 psi.
Have you ever seen a car tire burst? Or a propane tank? Big booms, they can easily hurt or kill people already.
A hydrogen tank would be 50 times more pressure than a regular tank of fuel, and 300 times more pressure than a tire. If those burst, people will die, and have their bits spread around the neighborhood.
Get your outside coil cleaned.
If the system is big enough for the house, there should be no reason it can’t maintain under 80 degrees unless something is wrong with it.
Check the filter in the house and check the outside coil for dirt and debris.