Hello everyone I have a question concerning my current HVAC system.
It is from 1991 and is an 2.5ton American Standard 8 seer AC and 80% furance...the particulars outside of that I don't know. If you need more please let me know. It is a single stage split system. Bills in summer at 78 degrees run 75-85 bucks but the system is only on from 6pm to 5am. Heating at 68-72 degrees ran as high as $185 (and was a very warm winter). I am located in KC Missouri.
My current problem is the main living area will get to the correct temperature as the single thermostat calls for but the upstairs is always 4-8degrees warmer/cooler. I have always used the auto setting and run ceiling fans in the rooms to help cool them off. I am the kind of person that will just lower temps in the winter or higher temps in the summer to save money, however my new finance is not, she wants to be comfortable period. Thus I am looking to improve my current HVAC system, either with a new one or a retrofit zoning system.
I can do the zoning system myself and looks like a good deal, 3 zone retro solution for a little over $...if this will work I would like to take the cheaper option as I hope to only be in this house less than 2 years. If I have to do a system give me some ideas.
Ok I am attaching a picture of the current ducting system, pretty simple 11"x22" main trunk line down the center of house with branches of 6" round ducts to wall vents. There are three returns, 1 at baseboard in living room, 1 in hallway of 2nd floor baseboard, and a 3rd that looks added in basement. The house is a split level 1395sqft with 300 sqft basement...nothing big. I just had an energy audit done which resulted in additional attic insulation, now R49, and air sealing so the house is tight (I can't find the report right now but was told it is to spec of what new homes require and my house in a 1959 build) The ceilings are all 8' tall, hardwood floors and tile in main living area, and carpet/tile in the bed/baths.
Here is the HVAC ducting
The main trunk is ran on the ceiling of the basement and 2 car garage so it is accessible. The 6" vent branches are accessible in the basement and are covered with sheetrock in the garage, so accessible but will need drywall removal. All are sheetmetal, and sealed but not insulated.
Can I zone this system? I would like to have a downstairs (living, dining, kitchen zone) and upstairs (2 bath, 3 bedrooms) zone with the overflow zone being the basement (currently media room, bath, laundry room).
I'm looking to do a VALUE option, if zoning isn't it then what is the better value option - investment in system compared to operating cost in conjunction with leaving in two years.
Please let me know what you think about the zoning option first. Can it be done? If anything is confusing or you need additional information please ask.