I've opened the outside unit and confirmed that it does not have a reversing valve inside. What next steps should I take now? Is it time to replace the compressor? The whole system? It's going to start getting over 90 degrees soon and I need to get this sorted. https://www.askmehelpdesk.com/images/smilies/frown.gif

I would first take the door off the indoor coil, then turn the system on. And check the indoor coil and the outdoor unit really good. See if you can see some frost or some ice in any patericular place and let us know.