I don't know how old my trailer is but I know its really old. We have lived here for 8 months, the summer out electric bill was about 200 - 250 and we just had our cheapest bill which is 98. The bills are bad enough but it doesnt stay cool/warm on one side of the trailer. In order to heat it comfortably the other half is miserably hot. So my kids end up sleeping with me. We are only going to live here, hopefully, another year and half until my husbands deployments are up. In the mean time is there a cost efficient way to help the issue?
Some of the problem is that on the "better" end of the trailer there is only about a 2 foot difference from the ground to the trailer, on the other end there's about 4 feet. most of the walls have been replaced, as well as some of the flooring, however most of the insulation underneath is hanging off or missing. I don't have any skills and much money to hire someone to do the work needed to properly reinsulate it. I can feel draft in the side of the trailer higher off the ground. I don't even know how to begin to find where they are coming from, other than an obvious hole. We already put way more money into "renovating" it than we expected, its temporary and "free". I would love to lower our bills, or at least get what we are paying for. It seems like we are heating/cooling the yard as much as the house at times.
Any suggestions?

There are so many items to check and I hate to do this over the internet.

It would be worth you while to pay a GOOD, RECOMMENDED heating, cooling contractor an hour service call and have him check it out and make recommendations. Try to ask for an older, experienced tech. The young guys know how to repair whant is broke but sometimes can't see pasted their nose. This will save you money by not doing something that will not help. Your money can be spent to correct the problems. When I was in service, I would always try to help the customer. Boss didn’t like it because HE would not make the money. I told him it was good will. When the need service, who do you think they will think of first.

You problem is more then just the 2 foot difference off the ground. Besides getting the flooring insulation back up in place, close off around the underside of the trailer. By blocking the wind from underneath, you won’t be blowing away any heat.

Make sure that all the hole where utilities come in are sealed. This includes electric, water, sewer and gas if you have that.

Keep in mind that heat rises. Check to see if it is warmer at the ceiling then near the floor.

If I read your problem correctly, one end of the trailer is gets hot and the other is cold. Not knowing what kind of heat you have, I am going to make a couple of guesses.

1) You have a “Through the wall” heater at one end of the trailer. This is the end that gets hot. There is no way for the heat to get to the other end. I would try a “Box fan” to try and blow some of the heat to the other end.

2) You have a ducted furnace that is suppose to supply the whole trailer. In this case, some to the vent may be turned off or block in some way. I have seen folks put furniture over or in front of the heating vents and wonder why they can’t get any heat.

I have a ducted gas furnace. All the vents are open and as much as I can tell unblocked inside as well. Some vents are not properly attached to the duct, when i first moved in i duct taped them back on, i don't think its working very well. The heater is in the middle of the trailer. I have crawled under the trailer to see if there was an obvious hole somewhere and there isnt. We (my father and I)replaced a lot of the flooring and inspected the rest, I know the insulation underneath is a joke. I really think there is a major problem from the heater to that end of the house, but I can't figure it out, it blows out with about the same stregth as the other end of the house, mabey a little weaker.

no furniture is over any of the vents, they are all open and free from obstruction.

During the summer we had problems with the a/c and had an older company come and do some work on it, the fan has been replaced, coils have been fixed, etc. They said the heater itself isnt all that old, not as old as the trailer anyway.

OK, now I am on the same page as you.

Next time the heat comes on, check the temperature coming out of each vent. You can just do this by hand. Do any of them feel warmer or cooler then the others?

Next, do they all seam to be blowing at about the same rate?

Do the ducts run under the trailer. Are the ducts insulated?

After they fixed the A/C did it work well? Did id cool the whole trailer evenly?

Lastly, be sure you are not using that so called gray duct tape. This is not what you want to be using. This was designed to seal ammunition containers for the Army and was called "Duck" tape for it's ability to keep water out. So now you know where the name came from.

Real duct tape is a heavy aluminum foil type tape. Also, no duct tape is made to hold the ducts together. They should be screwed or some how mechanically joined tegether.

I have a hunch that when they replaced the blow for your cooling, they may have not set the speed right for heating or used the wrong motor. I will not be able to tell you that for sure with out being there.

Did he have to order the motor for your unit or did he have it with him? If he had it with him, this may be truck stock and may have not been the "Right" motor for your unit. "This should work."

I know, I ask a lot of guestions.

Can you give me a better location in Tx.?

One last thing. Varmits sometimes get in to these duct and "Camp Out" blocking the duct a little. You might want to check that. Be Caeful you don't get bit by someting. Look before you reach. I speak from experience.

Longview, TX area. I am not real sure about when/ if the motor was replaced. Originally my brother was going to repair and live in the trailer but when my husband got deployed and I moved back he gave it to us, so he was here for that part of the repair.

I didnt realize that about the duck tape, thats good to know, lol. Especially since I believe thats what was used in the past to connect them. Unless there is some kind of "tape" used for that purpose.

The ducts do run under the trailer and between the floors and the insulation. This is why its hard to see if there's any problems with the ducts. I would have to remove the insulation, and since so much (insulation) is damaged I hate to remove what is still there.

Months ago I took a light and a mirror and looked for critters or nests living in the ducts, the trailer was not lived in for about 6 months so..., I could not see any obstructions.

The vent at the highest end of the trailer (the now cold side) doesnt blow at the same rate, its much slower. However, the duct coming up to the vent is different, it come up with a slant, so mabey as much air cannot pass through. I am not sure if that was a good explanation, the other vents are connected with a metal "box" that connects to to the ducts below. On the last vent I believe the main duct is angled up to connect. There is a vent mabey 10 feet from that one (closer to heater/ ac) that blows fine.

Before the work was done on the trailer the heat/ac barely worked at all. My cousin lived in it for 10 years and the last year she had little heat or a/c. I believe her ex had "worked" on it and put some things on backwards and who knows what else. Before that even when the a/c / heat worked "normal" the higher end of the trailer always stayed hot in the summer and cold in the winter.
We have planted a tree at that end, a year ago, and hope next summer that will help with the heat. That room also has a bay window, so I know we lose heat/ cool that way. It just seems such a drastic difference that something else would be to blame.

It is a Coleman Presidential 2, if that helps any. It is a large metal "thing" that is built into the wall of my hallway. At the bottom of the unit is probably the warmest place in the house, it blows hot air there, is that normal? I have asked technicians and my father about it, they all shrug it off, but its seems weird.

I can't believe I never notice this before, but yes the air is much cooler, almost cold, blowing out of the vents on the (higher) colder end of the house. The further away from the heater, the colder the air is coming from the vents. It is just now REALLY cold outside, which may be why I never noticed it.

After a minute of the heater blowing however the air warms up considerably, but the 2 vents at the end of the trailer are still a little cooler than the others, and the last one barely blows at all.
What does that mean?

Also last night I was in the warmer / lower end of the trailer and when the wind blew very hard the air coming out of the vent blew harder as well.

What does that mean?

It is really hard for me to pin point ALL of your problems over the internet.

1) Ducts need to be insulated so they don't give up their heat before it gets to the room.

2) It still sounds like you have a duct that is not fully connected.

3) I am not sure you furnance is working correctly.

Once again,it need to be looked at in person. Laying of hands has always been the best way.

Well thank you for your advice anyway. I did call a man that is familiar with my trailer and has been out here a few times this summer. He suggested that i try to reattach the vents and ducts and that there is probably a clog in the last part of the duct.
Thank you again for taking the time to help me!