This was something I was concerned about as well, not so much in the winters because the temperature does not drop very low often, but the summers can be very hot, and if I choose to assume all utilities this can cause high electricity bills in summer months.

Buyers and renters like them.The only time I would consider the wood framed double glazed would be in an extrememly high end house-- way more expensive than I'd ever deal in.I won't buy aluminim framed windows, period.Check the welds on the corners of the vinyl frames.

We solvent weld all plumbing with a union installed and then put linoleum in the cabinet.

I don't know what the temperatures are in Denver.

When the weather turns cold or when the weather turns hot, we will check in to make sure the unit temperature is maintained at a comfortable and safe level.

I can set a range that they guests can set the temperature to.

The four layers are incorporated into one product by heavy pressure and high temperature.

The rolls of material are welded together using hot air opposed to flame which makes installation safer.The light colors are reflective and help with cooling the building.They also are typically more water tight in regards to flashings, drains etc.With modified bitumen you typically have to seal to a metal flashing.

It's possible that there is a correlation between global temperatures and inherent weather patterns, but that doesn't mean there is any causation.

Which means something in or around the window is failing, or the temperature difference inside and outside the apartment are too great and insulation somewhere is breaking down.If its an old window then the putty is breaking down, if its a newish window, then it could just be caulk round the inside of the window frame allowing cool and warm air to mingle.Easiest thing to do is clean your windows regularly.