Some generalized info:
Safety and quality run together. A high-quality job is safe by nature.
A safety interlock is nice, but a design that doesn't need one is better.
Your 7500 btu compressor could quite possibly put out 9900 btu into a better condenser.
A 9900 btu compressor might not move 9900 btu through your existing condenser. It will definitely gobble up more power.
A 9900 btu compressor might move 12000 btu into a much better condenser.
Whatever happens, the darn thing already works way better than a 1500 watt aquarium heater.
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