They are the "heat sinks" that dissipate the heat from the hot, compressed gas to turn it back into a liquid.

Now I talk with my fiance about this and she immediately brings up all of the issues we’ve experienced in past places we ourselves have rented (Hot water was out for 2 weeks for the entire complex due to some landscaping guys busting a line in one apartment we lived in) and how she wouldn’t want to be the one directly having to deal with those issues.

I do this at night before bed so we don't run out of hot water when someone's trying to shower. 

I live in a hot market that I want to get involved while the market is still going through the change.

.- Gas Boilers - 30+ Years Old- Hot Water Heaters - 10+ Years Old- Electric Panel - Upgraded within past 10 years but could be upgraded even more- Pipes are old, corroded, and some leak often- Windows/Doors that haven't been updated require much more labor to remove/replace as the wood is often rotted- Roof is old, has recent touch ups but will need a major repair down the road (10 years hopefully)- Interior is covered with old wall paper, most walls have multiple layers and are a PAIN to remove- Also, shag carpets were apparently a thing back in the day so get ready to rip those bad boys up and replace them or refinish the hardwood if possibleThere is much more of course but those are some that I definitely noticed right away and are what I plan on tackling, priority wiseAny questions let me know!

I think I have normally been quoted around $2500 for a new outside unit, albeit here in Illinois it is not as hot.

The market is very hot, this is in hot area, with property appreciating year over year. 

@Fred Gonzalo in a hot market you can save about half the agent fees by using a cut rate listing service.

Super hot market.

I always say 'people before market' because you can have an amazing investment prop in a hot market that turns into a giant money pit if the people you trust to rehab, manage etc drop the ball.