What if you only upgrade one system as opposed to both? Well, the good news is that even if you upgrade only one system, the overall efficiency of your home will benefit.
After retrofitting your furnace, the average overall energy guide rating of your home will increase by 10%. A retrofit to your hot water system can lead to a 13% increase of your overall home’s energy guide rating.
A surveyed group found an average 20% increase in their overall energy guide rating as a result of retrofitting their entire home These efficiencies, of course, are dependent on the type of systems you choose for your home.