I personally prefer hardwood floors to carpeting because it provides a much healthier environment for you and your family. I do not think it will effect your heating and cooling bills, and was not able to find any information stating that it would have any effect when researching this subject.
Hard wood floors
It depends on who you get to do the job .I did it myself and it wasnt that hard
Hard wood floors are considered better than carpets if someone has an allergy because carpets hold dust and pollen far more. Hard wood floors are also easier to clean. Carpets are better at giving a warmer feel to the room and are softer on the feet.
Oil based cleansers are great for hard wood floors. Water or too many chemicals can really mess up hard wood floors. Every once in a while you can use the steam shark it works great.
Basic prefinished hard wood can be had for much less than parquet.
Vinegar and water
That depends what kind of 'film' it is.
Hard to answer because of all of the different rates of power across the country.
Installing hard wood floors can be extremely tedious. I would recommend having someone install them for you.
Upright Vaccuums clean better on carpetted floors and Cannisters work better on hard wood and tiled floors. Upright vaccuums don't work good on hardwood floors, but cannisters are excellent on hardwood floors.
wet paper towel with soap
In Sky Staircase, there are 50 floors, but Rayquaza is EXTREMELEY hard to recruit.