The answer to this is different depending upon the location of the home. Different markets value amenities differently. Adding a central air conditioner in Houston, Texas may add significant value, while putting one in a home located in Buffalo, New York might not have much impact.
As a rule, the most value returned from renovating a home comes in the kitchen. According to one national survey, kitchen remodels returned an average of 88% of the investment. In other words, a $10,000 kitchen remodeling project would add approximately $8,800 to the value of the home. Bathrooms were second, returning 85%.