Age and condition of appliances, heating ventilating and air conditioning (HVAC) units, and electrical systems, as well as plumbing, are taken into consideration in home appraisals. Replacing older units isn't always cost effective for many looking to sell their homes, but if everything is in working order, clean, or has a record of maintenance and even warranty papers, appraisal value probably won't suffer. However, if anything is in very bad shape, or not working properly, it could affect the home's value negatively. Improvements such as new appliances or replaced supporting fixtures such as ductwork and piping may be recorded positively.
There is a section on home appraisal forms for energy-efficient features, so pointing out energy saving improvements you've made to a home is worthwhile. Controls on water heaters, low-flow showerheads and appliances with the ENERGY STAR rating may make your home a stand out in that area. It will also make it more appealing to green, or environmentally conscious, home buyers.