We also had to replace the plastic shower/tub surround as it was cracked and had been caulked many times, and to insulate the basement to help save on her heating bill.This tenant and her family are the best, and we decided to spent what turned out to be over $3500.

Duct insulation may help somewhat.2c.

I'm a big proponent of putting extra insulation in between units for 'sound-proofing'.

Unfortunately there is nothing on the market right now except 95% furnaces and 15 seer ACs that would provide a greater payback.I wanted to use exterior foam insulation for this project to remove the conduction heat loss through the studs to improve R value from R19 to R28, but now have second thoughts.I built my house from SIPs, and did some other creative things to bit the code by 270%, but doubt that anybody would pay me more than 50K, even though I spent over 150k on these energy efficient improvements.This is a picture of the house that I built, had over 5000 people touring through it during Parade of Homes in 2013

Depending on the house construction, insulation, etc. this can be an expensive process to install all new ductwork (do you have access) and equipment.

It's mostly about how well insulated and air sealed your home that will affect your heating and cooling results in terms of comfort and energy usage/ savings.

Cost of prior event - ~$2800 to pull up two floors, replace a section of the subfloor; replace a portion of the sound / fire break insulation between the units; remove mould and mildew from the remainder of the subfloor and relay finish flooring in two rooms.They have comeback twice since then to ask more questions about our system.Ask me the question again in the spring and I hope to have more positive news.

The once lathe & plaster home has been stripped to the studs, completely insulated, re-plumbed & rewired (which passed inspection!!!).

Windows not only help with insulation, but also noise and a general feel of quality when you walk into a home.

To give some context, what I'm needing done is as follows: roof repair, 3-5 floor joists replaced or "sistered", surface mold remediation, 3 bathrooms remodeled, hardwoods sanded/buffed/finished, exterior and interior paint, drywall repair, granite countertops and new appliances in kitchen, new HVAC and ductwork, branches cut away from roof, gable vent repair, insulation.