Can you put insulation under siding?

Our home is 23 years old with aluminum siding. Its in good condition. I don't think that there is insulation under it. I called one contractor and they said they could blow it in from the inside by drilling holes every 16 inches at 5 feet high. So I'd have to paint. I don't want to do this. I want to... show more Our home is 23 years old with aluminum siding. Its in good condition. I don't think that there is insulation under it. I called one contractor and they said they could blow it in from the inside by drilling holes every 16 inches at 5 feet high. So I'd have to paint. I don't want to do this. I want to know, can a contractor take down my siding and put up some kind of siding that has an 'R' or 'E' value? What kinds are there? Please post any links. The lady said that foam back siding doesn't really offer any type of insulation.
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