Picking a competent installer?
I plan on replacing old double-hung windows and sliding doors with same sized new Marvins or Andersen 400s. The house has wood clapboard siding. What do I need to know to figure out which contractor would do the best installation? I've gotten burned by roofers and tilers that came recommended so I prefer to know what constitutes a quality job to help weed the clowns from the craftsmen. Are manufacturer's installation instructions complete in their detail from start to finish? Would a contractor experienced with Andersen products have any problems installing Marvins?