Hello everyone, I recently built a room in my shop, I am having some problems with my reloading dies rusting. My 10x12 room has an air conditioner, and it's well insulated. I have had to take my dies apart twice now, just to clean the rust off of them. I have also soaked them in a rust prohibitor. All of the equipment is hornady and the room has been built for a month now. Just looking for some advise on what to do. I thought maybe someone here has experienced this problem. Thanks.
How long ago was the concrete poured? What are your temps, humidity and dew point? Just looking at the concrete it looks like it's sweating to me, you may need to get a dehumidifier to keep the humidity down. Newer/greener concrete will sweat more, after a couple of years it cures more and will sweat less.
Shop was built in the 90's. the concrete is just stained. I guess I always thought that a air conditioner pulled the moisture out of the air. I keep it around 70 degrees but I turn it to the lowest setting when I'm in the room.
I live where humidity is a real problem. My shop is a place where anything would rust unless it was submerged in oil...I solved that problem by putting in a portable de-humidifier and installing air-conditioning. The de-humidifier warms the room to an uncomfortable level 9 months of the year but the AC brings it to 78 degrees and the humidity is kept at 30%...I am sure the electric bill is a few dollars more than before I added the AC and de-humidifier. Rust is not a problem for me any more. YMMV
"We hang the petty thieves and appoint the great ones to public office." -- Aesop
What size a/c unit do you have. If A/C unit is to big, it will not run long enough to remove the moisture from the air causing sweating issues. For a room that size, a 5000 btu unit is plenty. Larger units will cool too quickly and not dry the air. You might consider a Dehumidifier to dry the air.
The a/c can increase the humidity, think about your air compressor on a humid day, use the blow gun and it wants to shoot a water mist. A/c works the same way, compress the gas, it heats up, pump it into the condenser and it expands, cooling it and creating water vapor. Look at the back of the unit sometime and see all the water dripping off of it. A lot drips, but a lot gets pushed into your room.Originally Posted by hawgfan
I hope that makes sense.
My unit is a 12000. I know it's too big for the room, but the 5000 I bought wasn't cooling the room at all.
What size dehumidifier do I need to get.
Hopefully this will help you with that, http://www.dehumidifierweb.com/area-and-performance/
I have a few questions to ask is why do you keep raising and lowering the temperature. This will cause some issues with the humidity. I wanted to ask is the building completely above ground. Is the entire building insulated and what is the total size. I wanted to ask is the moisture from the floor or the walls. What state are you in to know the average weather. Do you notice more moisture during or after a rain storm and is the moisture their year round. I wanted to ask if the walls and floor were pour high pressure concrete with blue foam insulate in the upper concrete done with wall molds. This might seem like a lot, but it will give me some important knowledge to help you.
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I work nights so I usually leave the temp set at 70 but when I get home and go in there I turn the temp down to 65. The building is completely above ground. It's a 40x80 shop, but I built a small room that is 10x12x8. Only the small room is insulated, the rest of the shop is not. I haven't seen any moisture forming on the walls or floor. I have no idea what kind of concrete was used. The shop was built in the early 90's. I hope that answers all your questions. Thanks.
Thanks for the info
I had the same problem and solved it with a 52 pint de-humidifier. You will either have to empty the bucket when it gets full or you can run a small hose to the outside to get rid of the water that is removed by the unit. Worked like a charm for me. james
Hawgfan-where do you live? That could help us answer. If my guess is correct and you live in the Arkansas area a dehumidifier will probably help your problem. If you live in the desert and use an evaporative cooler for your air conditioning, that could cause the problem.
NRA Benefactor Member
Check outside and see where the water from your AC is draining. If it goes under the floor ...
Also add a location in your information. Southern Florida is different than the high desert and different than central Maine.
Wayne the Shrink
There is no 'right' that requires me to work for you or you to work for me!
quit changing the temp for starters. set it and leave it. with the up and down temps comes added moisture.
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I hope you have a window AC unit. If you have a floor AC unit that can cause moisture. I suggest to not keep raising and lowering the temperature as this causes moisture issues.
I know the calculations call for a 23 pint unit, but for the reason you are using the dehumidifier I suggest to use a minimum of a 50 Pint unit. I
I personally recommend the Frigidaire 50-Pint 3-Speed Dehumidifier that is Energy Star Rated Model # FFAD5033R1
LOWE'S Item # 581253
$229.99 that comes with a 10 year Limited Warrenty with a 4.5 rating out of 5.
I use this 70 pint unit personally, but it is not rated higher than 1, due to only one review on Lowes.
I just got the Frigidaire 70-Pint 3-Speed Dehumidifier that is Energy Star Rated Model # FFAD7033R1
Lowes Item # 5581253 $269.99
Please be careful as they sell one model that only has a 1 year Limited Warrenty of the 50 & 70 Pint units.
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I'd try running the 5,000 BTU AC on a timer; comes on early morning and runs till maybe midnight. I have an AC that size on a room a little bigger than yours, if I start it early, it will maintain 75F almost all day. But it won't really cool down a hot room, too small.
Running the room air over the cold evaporator will do the same job as the dedicated dehumidifier; water vapor condenses and you get lower humidity.
Sorry didn't add my location. I'm in Arkansas. About 55 miles from Memphis, TN
An air conditioner is one dehumidifying if it's running. A grossly oversized unit isn't going to dehumidify much to at all. It will knock the temp down but that's it. Get a dehumidifier and be done w/ it.
Personally I'm done w/ dehumidifiers that use refrigeration. But I also work for a company that makes desiccant dehumidifiers. They're cost prohibitive but are better in every sense. I don't expect anyone to consider one since we're talking close to $5k.
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