Heat from the windows

I bought a roll of Reflectix at HD. I have cut it to fit each window tightly and the vents and the skylite. Here in the Texas heat, it would reach 87 or so inside and the air would not stop. Now, with 50% humidity and 99-104 degree days, it stays at about 78 with the Reflextix. I then pulled all the vented covers and foil taped everything that looked like it would leak air. I then went upside and took the cowling off the air and foil taped the styrofoam back in place around the fan, plugged holes where air was escaping around the coils and also cleaned the coils with coil cleaner from HD. It made all the differenence, it now is staying 76 and will cycle ocassionally with my 1 13.5 air. I turned around and did the same on my 80 year old Dads Cardinal. I also changed out thermostats to Digital. Now his air cycles where before it never did. He is one Happy Camper now.....as well as myself!