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You must have paid without inspecting the work. Building code requires a weather barrier under the siding and that it be taped at openings and all seams. Was there a permit obtained to do the work? If not, did your locality require one. If they did, report the contractor to the inspection department as having not pulled a permit and gotten the right inspections. They may be able to help you and it oculd be a license violation in your state. Although most will refuse if a permit was not obtained and the proper inspections performed. Maybe they will go after the contractor and have them make it right. Have you checked your ceiling insulation? Heat rises and if the attic is not properly insulated(This is where 2/3 of the heat escapes from a house. and the soffits(overhang)need to be vented. Heat will escape through the roof. How about your windows. Caulking around the j- channels where it meets the frame may stop some air and water infiltration.Do this with a clear caulking made for that purposed. A lot of heat escapes through windows if they are not properly sealed. You may be able to put some plastic film over the windows and inside casings like 3-M. This may also help you with heat loss. There are foam inserts that you could put in the electrical outlets by removing the cover screw ,,pulling the cover, putting them in place and then puttng the screw back in. Maybe the walls should have been insulated while you had the siding off. There are many things you havent't told us but these are ideas that may help your situation. It sounds like you do not have a foundation with blocks. But they are also a souce of heat loss. If you do, you could insulate the rim joists with a high density foam sheet and cut them to fit. and then use caulk or spray foam to seal around the edges. Hope this helps you.
J.H. Fiber cement is composed of 70% concrete and 30% celluoose. Cellulose being ground up paper. Both water and cement wick moisture so if you use these products be sure to read and follow installation instructions. Leave no surface unpainted or it will draw moisture and deteriorate. Seen it many times. It is also dusty if you cut it with a saw. It is heavy, breaks easily if flexed. It is also heavy so it only comes in 12 foot lengths for the most part. It has the insulation value of cement which R-1 per inch. It is 5/16 thick so you get 5/16 or R-1 which is not much.
Vinyl is plastic but it is about half the price and any handyman can install if they follow directions so it can expand and contractl. Don't expect it top lasd forever. Hail storms beat it up pretty bad if the stones are big enough. One caution with it is do not place a grill near i, vinyl melts at 150 to 165 degerees depending on how thick it is.
In my opinion steel is a little costiler but in most cases lasts for a long time. If you figure it out, you will replace vinyl about every seven years. My stleel has been on my home in a hail region since 1975, No hail damage. You do the math.
If you are unsure check with the BBB. your state licensing board, and go look at several references where they have done instalations. Talk to the owners if you can and see how they were treated. These three things should tell you a lot about who you are dealing with. also have them give you the name of the brand of cement board and have them describe exactly what they propose to do. also look to see if one is prefinished and one is not. Prefinished are more expensive Good Luck.
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