Because, as you might imagine, a tenant turnover will cost considerably more than $225, but as @Thomas S. mentioned, the actual insulation bill for an attic will be considerably more than $225.Go to www.homewyse.com (I love this website by the way), select "Installation", then, "insulate attic" and see that their rough estimate range is from $1.59 to $3.08 psf (labor and materials), but then it depends on whether they are insulation batts, or blown in type insulation.In any case, if the existing attic insulation is inadequate, then maybe this "upgrade" might be warranted, regardless of how long the tenant has been there. 

I have a duplex in Echo Park and I am looking to install HVAC.  

A private installment note between two private parties (no banks). 

There is a big difference between a do it yourself handyman and a professional that does repairs and installations for a living day in and day out.

I have two buildings where the utilities are shared and to avoid high temperatures in the the apartment in the winter, I install programmable thermostats that limit the upper temperature.

I installed a new hvac unit in my personal house, blew in 12 inches of insulation, added soffit vents 8 more of them, a ridge vent , and added storm windows at the recommendation of my hvac contractor. 

They will let you know if you need to upgrade the kitchen and install an HVAC because they know what the other homes in the neighborhood have.

They immediately offered me a $20 discount to stay with them, but this was after I already had the other service installed.

Looking for a reputable hardwood floor installer in Memphis.

The installation of the boxes will run around $30 a door versus around $500 a door to run the vent outside.