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.

thinking in aspect of ice, snow, wind, and also temperature in summer and winter.

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.

But mini-split systems are much less expensive to install compared with conventional fully ducted systems that require a furnace and an air conditioner.The other advantage is that you get more localized temperature control in each room. 

Especially my daughter who went to Alaska where the temperature drops to 50 below zero.

A savvy investor buying in the winter also checks the date to see if the water was weatherized before freezing temperatures or not.