I cannot find real people on-line that have installed their own mini split ductless air conditioners. I can find literally hundreds of them for sale, but nothing on problems or ease of installation. I have an HVAC license, form when required to buy R-12, and have serviced many central air units. I am looking for people who have experience with mini split systems, and any recommendations or warnings, before I decide on which unit to install. I am looking for 12,000btu heat pump type, maybe with electric secondary, for my 100-year old farm house. Currently using 4-window units for entire house.