I Think The Dryer Is Additional Stuff And You Have To Find The Right Kind Of Dryer For It.......It Can Be Installed In High Pressure Line As Came As You Have In Your Cars....! You Just Need To Make Sure You Have Right fitting For It....!
Regard Stabilizer So Get Universal Copper Relay Type One.....No Need Of Servo.......It Serves Good...And Even Stabilize QUiet Low Voltages .....! I Have No Issues With Them...Using Two On Them....!
For Room Size...The 1 Ton Is Enough If Room Temp Is Like 31-33 Degrees And You Want Something Like 28-27 Degrees....It Will DO It Easily........! (29 Degrees Is Enough To Make You Feel Easily Comfortable And Let You Sleep Like A BOSS)..I Never Shoot For 22Degrres...No One Needs A Sudden Temp Change..! Bad For Health And Joints Also....!
If Your Roof Is Facing Direct Sun Light.......Heat Proofing Is Must....I Would Suggest To Get Some Shade..Works Better And Longer....The Roof Cooling Shielding They Do Usually Last Max 2 Years.....After That U Need To Get It-Recoated....!
For Cheaper Solutions......Get Your roof Clean Throughly ...Wash And Dry....And Then Apply ICI Weathershield Primer And Then Apply ICI Weathershield (Sun REFLECT)............It Will Work Better Than Those Company Coatings....!
Other Option Is To Coat It WITH ENAMEL.....2 Coats Of Bright WHite ENAMEL...It Will Reflect The Sunlight.....And Is Washable Also...!
Make Sure Wharever U Use...Use BRIGHT White Color..............!!
More Cheap Is To Use (White CHOONA) Mixed With Glue......(50/50 Or 60/40) Whatever Suits Best.....Works Good But Will Washaway With Rain Mostly And Need A Recoat Every Year Or 2.....