Back in 2002, when I was convinced there was a housing bubble, it would have been really convenient to have a tool like what HeatMap.com has just introduced. The Rent Ratio Heat Map calculated the ratio of rent over the listing price of homes in an area to determine whether it makes more sense to buy or to sell. HotPads is able to do this because it has a database of over 150,000 rental and 1,500,000 property listings covering most major zip codes.
Below, I have included a heat map of Boston.

The red areas have a low ratio of rents to home prices. It makes sense to consider renting on those towns.
The blue areas have a high ratio of rents to home prices and it makes sense to consider buying.
For a good article on using the Rent Ratio, read the NY Times article.
To see what's happening in a zip code or city or state, check out the Rent ratio heatmaps on HeatMap.com.













