Hi, I'm really needing some insight on my AC unit. We purchased our home after my mother in law lost it to foreclosure a year ago. It's an older home build 1960, 1266 sq. Feet. They had the central heat/air unit put in about 10-12 years ago. When my husband and I purchased we completely reinsulated the attic to above the recommended amount. My mother in law was having someone come service the AC once a year right before summer hit, and they always cleaned the indoor coil. Because our home is older there's a vent on the wall right above the floor, all others are on the ceiling. The guy that has serviced it said as long as the vent is there it acts as a vacuum and attracts any dust and dog hair making it get dirty fast. I change the filter once every 2 weeks, I dust once a week, have vacuumed out the closet that holds the indoor part of the unit etc. Our outdoor coil freezes all the time! I keep it set at 74 in our home which is still warm to me, but helps it freeze less. Even so, In the year we've owned the home its frozen about 6 times since summer started. And it never fails, when it rains it automatically freezes. On top of the coil, It struggles all day! It runs the moment the sun glares in and goes nonstop until well into the early morning hours. So it may not run a total of 2-4 hours in a 24 hour period. My bill is over 300 every month. Our AC guy has checked our freon, cleaned our indoor and outdoor coil, checked condenser and checked fan.. everything. I'm at a loss! Why does or freeze so much, and why does the rain trigger it? My house is also super dusty, does that have any relation to my issue?

Hello, I am new to this forum and this is the closest topic I could find. I am currently renovating my apartment and making a study room which contains no windows and no heat or AC. However, it is taking the place of a kitchen so pipes are available. I am very unfamiliar with AC/heating world.. Is there any possibility of placing an AC/heating unit in this room without a nearby window? Thank you for all your help.