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I have been stumped on this problem for a few weeks now. I completed an HVAC course last year, but mainly for my own benefit on my rentals, so I don't get a ton of experience. The tenant has complained about low heat from the heat pump. The system is about 10 years old R22. I'm not real familiar with determining subcooling/superheat during the winter with the low ambient temperatures. However, I thought I would get the measurement anyway. When I attempted to determine them, I put my gauges on the system, and both sides were equal (yes, my manifold valves were shut). I switched heating to cooling and the pressure rose, but was still equal between the sides. I didn't even bother to determine the SC/SH. The suction and discharge lines were significantly different temperatures, and when placed in heat mode, the normal suction line (larger tube) was indeed hot and heat was being put into the home. I've read some posts from previous years that members have commented on and several mention the reversing valve. This may be a factor. I am in N. Florida so lately, some days we may still place the system in cooling mode. It seems to cool well in cool mode. My thought is that it would be a failed metering device or compressor, since these are the components that separate the pressures. I have not checked the compressor draw and know I need to, but the equal pressures with temperature differential on the suction and discharge through me for a loop. I'm not thrilled about it, but at this point I think I need to recover the refrigerant, replacing the filter/dryer of course, and the metering device. I think that if it were the compressor there would be no temperature difference.. Any help... Thoughts... ideas... would be appreciated. Thanks.