My girlfriend and I moved into our new house a couple months ago. It was a great two story house in a newer subdivision. It was spring when we moved in and we did not even turn on the air conditioning for several weeks. On the first really hot night, I noticed that our bedroom was not cooling down. We slept on the second floor and had been downstairs all day. The AC was running and it was very comfortable on the first floor. But when we headed to bed, we noticed it was quite a bit warmer upstairs. The cool air was not making it up to the second floor. The very next morning, I called a local HVAC company and explained our situation. They asked me some questions like are the vents open upstairs and had it been cooling that area before? I quickly checked the vents and they were open with only a small amount of cool air coming out of the vent. I explained that it was a new house for us and it was the first time the central air conditioning had been turned on this season. The HVAC service company dispatched a repairman and he soon arrived to take a look at our air conditioning system. He check our AC components and went upstairs to check the air flow. He suggested that there were a couple things we could do. One was to close the vents downstairs when we wanted it to be cool upstairs. Or we could get a bigger and stronger AC unit that could push the air to all the vents of the house. While the vent thing sounded like the cheapest solution, it did not take long to realize that it was harder to do than it would appear. So we decided to opt for the new stronger and better unit that would be able to keep us comfortable and not worried about opening or closing vents.