I have 4 patio doors that I have to periodically replace over the 20 years I've lived in my house due to the seals leaking allowing moisture in between the panes of glass. I now have 2 panels that need to be replaced again! One local glass shop recommended I use tempered glass instead of insulated glass as this will aleviate the problem of the seals breaking and I won't have to replace them anymore. My concern is - will this affect resale? will this affect the temperature in that room greatly - it is very hot in summer and very cold in winter, will it look different? It certainly will save me money in the long run. He also priced a low E tempered glass which is only $10.00 less than the insulated glass. Does anyone have any recommendations. Thank you, Wenjen