One of the advantages of a window a/c unit, is that they are much cheaper, and easier to repair due to their small size. Central a/c is better at cooling the entire home, and generally last longer before needing repairs.
No.
Using window units instead of a central unit, in main points you want to cool. will save on your electric bill.
Window units are only a good deal when you're using them to cool down a small area. Some window units are only capable of cooling one medium sized room. However if you live in a very small home one or two window units can be bought relatively cheaply and will satisfy your rather limited needs.
Portable AC units, window AC units and central air all has their pros and cons. But to compare a portable ac unit to central air is comparing apples to oranges. Similar in the fact they deliver cool air but ac unit does a complete home whereas a portable ac unit only cools a single room. The price therefore must be based on how many portable ac units it would take to cool a whole house.
I have lived in apartments with both and central air is definitely worth every penny. I can finally be in every room of my apartment rather than having to stay in the room with the air unit. Yes, window shakers are just that.
It would be smart to just buy a new window. It will be stronger and last longer than a repaired one. Although, repairing the window would be cheaper. You have to pay for less materials but more man hours. So, to answer the question in full, repairing the window would be much cheaper than replacing it.
To cool more than two rooms it is economically more efficient to purchase a central air conditioning unit than a wall unit. Wall units are individually cheaper than central air, but if you have to buy more than two, then it is better to buy the central air unit.
Window units are more efficient than Split-Acs. Not the other way round.
The cheapest option between electric, radiators and central heating is Gas Central Heating. The reason that gas is cheaper than electric is because electricity costs 4-6 times more than gas.
The average price for a normal window fitting size of roman shades is about $170. They can be cheaper than this but the cheaper ones tend not to last as long and start to look scruffy quite quickly.
Because of a lack of space in Central London it is cheaper to build up instead of out.
Newer models are designed to be energy efficient. There are different types of window units, which would be compared to the windowless room units as well as whole-house cooling by central air. Central air is more efficient than using a window unit in every room in the house. To determine the best option for your home, you'll have to consider the electrical system, size of the home, vent system currently in place, use of each room, etc. There is no one solution for every home.
You can buy buy a new glass window at Home Depot or Menards. You can also look at Lowe's because they might be a little cheaper than the other two stores.