So where you going with this? Trying to prove that Dirty Roofs are making your home less energy efficient? Maybe we should document the Billing cost of heating/cooling used in home before Roof Was cleaned then after.Then again this is gonna be hard because the Temperature are just so different and change so much we will never have accurate results.You need to have the same inside home temp for the dirty roofs being tested same outdoor weather which means temperature wind humidity all that crap its a lot best bet is contacting local science department or college and giving them a project or Maybe Myth Busters haha
I have had about 4 customers over the years call me and tell me that their cooling bill had actually dropped after having their roofs cleaned. Thats proof enough for me. Here is a picture of at least two of them that I remember who called. Geeze, I wonder why their electric bills improved.