Thanks for the quick reply Jim. This is a very good point. My old toilet is a Kohler that I installed in about 1980. It uses about 4 gallons per flush, and does nearly use all the water in the tank per every flush. Here in Chicago, the temp and humidity can swing a lot in just a few days. So air con does not come on until the weather finally settles down. This Kohler sweats easily under these conditions. I did my own tank insulation years ago, and it worked great. If the water does not totally empty the new Dalton tank, I might be OK. I will be installing the new Dalton in about 2 weeks. I just noticed that another fellow purchased a different tank for his Dalton that had the insulation.