I amsure that the new refrigerant type (R410?)

Why don’t you live in a refrigerator box in the woods and really save lol geez man you make 6 figures and you’d would live like an animal just so you don’t rent ?

I had a rental built in 2010 that had a TRX valve lock up in 2016 which means the refrigerant was not flowing. 

This is what one company's tune up entails:Spring AC tune up:Indoor Unit*Blower Motor *Amp Draw *Bearings *Blower Wheel Balanced *Control Board *Operating Properly *Incoming Voltage*Connections *Low Voltage *Electrical Connections *Change/Clean Filter *Capacitor *Thermostat *Check Operations *Outdoor Unit*Compressor*Amp Draw*Condenser Fan Motor*Amp Draw*Bearings*Capacitor*Electrical Connections*Clean Condenser Coil(water)*Check Refrigerant Levels*Check Contactor *Relays Operation*Check Operations*Clear Condensation Lines*Furnace:Fall Maintenance Checklist*Replace Filter*Electrical Connections*Check Thermostat*Verify Blower Condition*Check Control Operations*Check Control Board*Check Capacitor(s)*Amps of motor operations* Check Relays*Heat Exchanger Condition*Burner Condition* Remove and clean flame sensor* Inspect Blower Wheel*Inspect and check ignition operations* Check ALL safety operations* Verify a good clean burning flame*Are these pretty standard work supposed to happen for tune ups? 

I’m thinking I can diy install it myself, and then call a tech to come charge it with refrigerant.

I have installed a new refrigerator and a new stove.

That would be for permanently affixed items, so it would not include something like a refrigerator.

Use tile no carpetFresh coat of paintMake sure all the plumbing works and no leaksFind out the age of all the appliances if it is in their last legs I would have money set aside to replace them at a moments notice (I had to replace 3 refrigerators and a stove in 2.5 months). 

Investment Info:Small multi-family (2-4 units) other investment. 2 bedroom 1 bath living area 820 sqft kitchen whit appliances, refrigerator, range,microwave.

It will have a mod to high refrigerator, washer and dryer.