I'm looking to have central A/C installed and contemplating beefing up the attic insulation and could use some recommendations from the Hearth crowd. I may do the insulation myself or possibly have the A/C guys do it. House - Built in '96, 1800 sqft tri level, 1450 sqft main level with sunken living room + 350 sqft rec/mud/stove room on a slab. Current insulation is R-30 attic, R-19 walls, R-11 basement. Garage slab is level with the rec room slab and under the bedrooms and has R-19 above the garage/under the bedrooms with R-19 walls & 1.5" insulated steel garage doors. Currently my attic has 8" east/west joists with 12" bats of R-30 fiberglass. There is a 12' x 16' area above the master bedroom that is decked out for storage. Before I put that decking down I added 2x4's on top of the 8" joists so the insulation would not get compressed. This area is most likely going to stay as is. What I would like to do is beef up the rest of the attic insulation. How much insulation should I add? What kind? and How to orient it (cross hatch i.e. run it north south) ? I have 2 options for A/C - to replace the current 12.8 K living room & 8 K master bedroom units. Option #1 - 30 K Mitsubishi mini split with heat pump option. This would be an 18 K head for the dining/kitchen/living room (relatively open floor plan) and a 9 K head in the master bedroom. $8.5 K and done in 1/2 day. I don't need the heat pump option. I don't like forced air heat. Option #2 - 3 ton fully ducted central A/C with high efficiency air handler & high efficiency filtration. $9.5 K and done in 2-3 days. This is my choice because it will have one or more ducts in all rooms (except the bathrooms & downstairs rec/mud room). I currently use oil HWB for shoulder season and a wood stove for most of my winter heating. Hopefully this summer the stove will be put to pasture as I get my wood boiler connected. The wood boiler & storage will do the whole house with a Modine type unit in the garage. A Nyletherm will take care of summer DWH and dehumidify the basement (although basement humidity is not currently a problem with the 2 window A/C units). Currently sitting on 9+ cord (mostly oak) with 15 more dead mature oaks to take down due to severe caterpillar damage.