You can install AC in Maruti 800 std its not an issue. To know the price of the installion in your car, please contact the nearest dealer of your city. I would also like to suggest you to exchange ur car for a new m800 with AC which will be a better option if u can afford.
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Repainting cost depends on the vendor among other factors. It should be in the whereabouts of 25k-30k. Moreover, you may also get in touch with the Maruti authorized service station for the same. Please click here to find the Maruti service stations. Select the desired city in the drop down list.
"XI" indicates that car is equipped with a petrol engine and "DI" indicates that car is equipped with a diesel engine.
LXI stands for base variant.
VXI means it is a full option car.
ZXI means added featured car along with full option like ABS, Airbags etc.
If you see LDI, VDI, ZDI - it is a car with respective features and the difference is that it replaces XI with DI which means that it is a diesel car.
In general, throughout the range, Maruti nomenclature shows that the LXI/LDI are the lowest versions loaded with just the bare minimum. The VXI/VDI are the next that come in the line with some added creature comforts and cosmetic beauty. The ZXI/ZDI are the top end variants loaded to the boot with all the possible cosmetics and comfort equipments that can be packed into the car.