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I'm sorry to hear about your issues with your heat pump system. When you say evaporator outside, I'm assuming you mean the condensor. The evaporator is the coil above your furnace or air handler. If it is not producing much heat, chances are they did not properly charge it when reconnecting it OR, they did charge properly but some has leaked out due to a leak.
The charge needs to be checked by an HVAC expert using a guage set. Typical pressures for R22 on a 70-8o degree day (in the AC mode) would be around 60-65 PSI on the low side, approximately 200 PSI on the high side.
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