I need to do a whole house, but cannot find a store that sells double pane windows at all. So I must have read every thread in the archives here mentioning double pane windows. And I've reached out to some of the companies listed without success. Can anyone recommend a current source for double pane windows? I am in Phetchabun province but can travel to Bangkok or Phitsanulok if needed.

I take it you mean double glazed windows? If so there have been a couple of threads that I know of but specific to Pattaya re UPVC where double glazing is an option. Latest one I think here -http://www.thaivisa.com/forum/topic/745994-upvc-companies/

Sorry have no idea re your location.