- 17 minutes ago
A fan, two frozen water bottles, and a quarter cup of salt can cool a hot room without buying a window unit. Using a simple Amish homestead method, this tutorial shows how a small oscillating fan can drop the temperature in a kitchen or family room during the worst July and August heat.
The build is practical and frugal: fill 1-liter bottles with salt water, freeze them overnight, strap them to the back of the fan with zip ties, and place a towel underneath to catch condensation. The video also explains why salt water stays colder longer, how the airflow works, and where this active cooling method fits alongside passive cooling tricks like shade, wet sheets, and night ventilation.
It is a useful off-grid cooling guide, a DIY fan hack, and a low-cost summer comfort solution for canning days, bedtime cool-downs, workshops, and single-room relief when the heat is too much. The method is honest about its limits: it cools one room, not the whole house, but it can make a real difference fast.
Search terms: DIY air conditioner, fan and ice bottles, frozen bottle cooling method, off-grid cooling, homestead cooling tips, summer heat relief, room cooling hack, Amish home-saving methods, and low-cost DIY cooling for hot weather.
The build is practical and frugal: fill 1-liter bottles with salt water, freeze them overnight, strap them to the back of the fan with zip ties, and place a towel underneath to catch condensation. The video also explains why salt water stays colder longer, how the airflow works, and where this active cooling method fits alongside passive cooling tricks like shade, wet sheets, and night ventilation.
It is a useful off-grid cooling guide, a DIY fan hack, and a low-cost summer comfort solution for canning days, bedtime cool-downs, workshops, and single-room relief when the heat is too much. The method is honest about its limits: it cools one room, not the whole house, but it can make a real difference fast.
Search terms: DIY air conditioner, fan and ice bottles, frozen bottle cooling method, off-grid cooling, homestead cooling tips, summer heat relief, room cooling hack, Amish home-saving methods, and low-cost DIY cooling for hot weather.
Category
🛠️
LifestyleTranscript
00:00It is the hottest week of July.
00:02The thermometer on your back porch reads 98 degrees Fahrenheit at 3 in the afternoon.
00:08The sun has not moved from above the back deck for the past 4 hours.
00:14Inside your house, the kitchen has crept up to 86 degrees because Esther was canning peaches
00:20this morning and the wood cook stove ran from 6 a.m. to noon.
00:25The wet sheets and the windows are helping.
00:27The shade strategy on the south side of the house is helping, but the kitchen still feels
00:33too warm to sit in and the family is gathering for supper in 20 minutes.
00:38You walk over to the small oscillating fan in the corner of the kitchen.
00:43The fan that runs from the solar battery set up in the barn, 12 volts, 50 watts, almost
00:50free to operate.
00:52You reach behind it and pull off two large frozen water bottles that have been sitting
00:57in the ice box since this morning.
01:00You strap them to the back of the fan with two zip ties.
01:03You turn the fan on.
01:05Within 5 minutes, the kitchen temperature drops from 86 down to 75.
01:12Within 10 minutes, down to 68.
01:15Cool, oscillating air sweeps across the table while the family sits down to supper.
01:21The bottles last for the next 6 hours.
01:25The total cost of this cooling setup, beyond the small fan you already owned, is $0.
01:33I want to be straight with you before I go further.
01:36We already covered the passive cooling methods in our Cool Any Room By 15 Degrees For Free video.
01:43Wet sheets in the windows, the cellar daytime retreat, the night-cool day-seal ventilation
01:50rhythm, strategic shade, the xere pot for slow, constant cooling.
01:57Those methods handle most of summer for most American homes.
02:01But there are some weeks in July and August when even the wet sheet method needs a bit more
02:06help.
02:07Heat waves of 100 degrees or higher, multiple days in a row, when the kitchen needs to be
02:14sittable for canning, when the family room needs to cool down before bedtime, when one
02:19specific room needs more than passive cooling can provide.
02:24For those weeks, what I am about to show you is the technique that gets you through.
02:29This method works because it combines three things plainly.
02:33A small oscillating fan that moves air around the room.
02:38Two large frozen water bottles that absorb heat from the air as it passes over them.
02:44And a salt trick most folks have never heard of that keeps the bottles colder longer than
02:50plain water would.
02:51Total upfront cost if you already own a fan and have water bottles, $0.
02:58If you need to buy a small oscillating fan, $20 to $40 one time.
03:04The bottles last 5 to 8 hours per freeze cycle.
03:08You can re-freeze them every night.
03:11You can run this setup every hot day of summer for the next 10 years without ever paying for
03:17it again.
03:17I am Elias Yoder.
03:20I am Amish and I farm in Lancaster County, Pennsylvania.
03:25Our farmhouse does not have central air conditioning.
03:28It never has.
03:30For 300 years, Pennsylvania Dutch farm families have lived through summers like this one using
03:37the methods we cover on this channel.
03:40Today I am going to walk you through the active cooling technique that pairs with our passive methods,
03:45methods, the chemistry of why it works, the salt trick that makes it work twice as well,
03:51the five step build, the honest scope on what this method can and cannot do, and the small
03:58notes that make the difference between a cooling setup that works and one that drips water all
04:04over your kitchen floor.
04:06By the end of this video, you will have a fan and ice bottle setup that costs nothing to build
04:12and delivers real, measurable cooling to any single room in your house.
04:18Quick word before I go further.
04:20The old methods my family uses.
04:23There is more of it than fits in any one video.
04:26I gathered the whole of it into a book at EliasYoder.com.
04:31The book is the long version.
04:33If you want it, it is there.
04:35I will not mention it again.
04:37Now, the chemistry, the salt trick, and the build, plainly.
04:43Why this method works.
04:45The honest physics.
04:47When the fan blows warm room air across the frozen bottles, heat transfers from the air
04:53into the ice.
04:54The air leaving the bottles is several degrees cooler than the air that entered.
04:59The fan moves that cooled air across the room, and the oscillating motion spreads it across
05:05a wider area than a fixed position fan would.
05:09As the bottles melt over the next few hours, they continue absorbing heat from the air flow.
05:15The room temperature drops measurably.
05:18Real heat transfer chemistry.
05:21No magic.
05:22No fabrication.
05:24The key principle.
05:26Cold transfers from a cold surface to warm air.
05:30The more surface area of cold the air touches, and the longer the contact time, the more
05:36heat moves from the air into the cold surface.
05:41Two 1-liter bottles strapped to the back of a fan create about 10 to 12 square inches of
05:47cold contact surface for every cubic foot of air the fan moves per minute.
05:52That ratio is enough to drop room temperature by 10 to 15 degrees Fahrenheit in a 12 by 15
05:59foot room within 10 to 15 minutes.
06:03For comparison, a window air conditioner unit uses electricity to power a compressor that
06:09does the same thing on a larger scale.
06:12Your home AC condenser sits outside the house.
06:16It draws warm air through coils filled with refrigerant.
06:20The refrigerant absorbs the heat.
06:23Cool air blows back into the house.
06:26Same principle.
06:28Very different equipment.
06:29Very different electricity bill.
06:32A central air conditioner costs about $150 to $300 per month to run during peak summer.
06:39The fan and bottle setup costs almost nothing to run.
06:43The salt trick.
06:45The chemistry that makes the bottles work twice as well.
06:48This is the part most folks have never heard.
06:52When you add salt to water before freezing it, you change the chemistry of the resulting
06:57ice in a way that benefits cooling applications.
07:02Pure water freezes at 32 degrees Fahrenheit.
07:05When it melts, it returns to 32 degrees as soon as it transitions back to liquid.
07:12The melted water reaches room temperature within an hour or two of being out of the freezer.
07:18Salt water is different.
07:20Adding salt to water lowers the freezing point.
07:23This is called freezing point depression.
07:27The chemistry is documented in every physics textbook.
07:31Salt molecules dissolved in water disrupt the formation of ice crystals, so the water has
07:37to get colder before it can freeze.
07:39For a one liter bottle, the recipe Esther uses.
07:44One quarter cup of regular table salt dissolved in the bottle of water before freezing.
07:50Shake the bottle thoroughly to dissolve the salt.
07:53Place in the freezer.
07:55The result.
07:56The freezing point of that salt water drops to about 25 to 28 degrees Fahrenheit, depending
08:02on the exact salt concentration.
08:05A home freezer running at 0 to 10 degrees Fahrenheit will freeze the salt water all the way down
08:12to 10 to 15 degrees Fahrenheit.
08:15The frozen bottle is colder than a plain water bottle would be.
08:18More importantly, as the salt water ice melts, it stays colder for longer.
08:25The brine solution that forms stays well below 32 degrees Fahrenheit during the entire melt
08:31cycle.
08:32Pure water ice transitions to 32 degree water and warms steadily from there.
08:39Salt water ice keeps the air flow off the bottles cooler for the entire two to three hour melt
08:45period, not just the early phase.
08:48The practical difference.
08:51Plain water bottles cool your room effectively for about four to five hours.
08:56Salt water bottles cool your room effectively for about six to eight hours.
09:01The same fan, the same room, just one quarter cup of salt added to each bottle before freezing.
09:08Critical scope on the salt amount.
09:10One quarter cup of salt per one liter bottle is the right amount.
09:16Use less and you get less freezing point depression.
09:20Use a third of a cup or more and your home freezer may not get cold enough to freeze the
09:25bottle fully, leaving you with a slush rather than a solid ice block.
09:30One quarter cup is the sweet spot.
09:32Before I walk through the five step build, let me pause for a moment.
09:36If you want help putting these old fashioned home saving methods to work in your own house,
09:43join our Amish home savings system and community.
09:48Esther and I are inside answering questions and the community helps you stay with it.
09:54The link is in the description.
09:55Now, the five step build plainly.
10:00Step one, gather your materials.
10:03You need one oscillating standing fan or table fan with a removable front grill.
10:10The size and style do not matter much.
10:13A small 12 inch table fan works for one person in a single sitting area.
10:18A larger 18 inch standing oscillating fan works for a whole room.
10:24Both work with the same method, just different cooling capacities.
10:29You need two 1 liter plastic water bottles.
10:32Look for the slightly larger 1 liter size, not the small bottled water size.
10:39Common bottles like a 1 liter sports drink bottle, a 1 liter water bottle, or any clean
10:451 liter plastic bottle works.
10:47Make sure the bottles are BPA free.
10:50Most modern food grade bottles are.
10:53You need 4 to 6 zip ties.
10:56White or black, the color does not matter.
10:59You will use 2 to 4 zip ties per bottle to secure them to the back of the fan.
11:05You need 1 quarter cup of regular table salt per bottle.
11:09Standard iodized table salt, or any cooking salt, works.
11:14Sea salt, kosher salt, pickling salt all work.
11:18The chemistry is the same.
11:20You need a small towel or absorbent cloth to place under the fan.
11:25As the bottles melt, condensation forms on the outside of the bottles and drips down.
11:31A towel catches it.
11:33Total cost if you already have a fan and water bottles, $0.
11:39If you need to buy a small fan, $20 to $40 one time.
11:45Step 2.
11:46Prepare the salt water and freeze the bottles.
11:49Fill each 1 liter bottle with water, leaving about 1 inch of headspace at the top.
11:55The headspace is important because water expands as it freezes.
11:59A bottle filled to the cap will burst open in the freezer.
12:04Add 1 quarter cup of salt to each bottle.
12:07Cap the bottle tightly.
12:10Shake vigorously for 2 to 3 minutes until the salt is dissolved in the water.
12:15You should not see salt crystals settled at the bottom.
12:19Place the bottles in your freezer overnight, or at least 12 hours before you want to use them.
12:24Salt water takes slightly longer to freeze than plain water.
12:2812 to 18 hours is the safe freeze time.
12:32Once frozen, the bottles will be solid ice at about 15 to 25 degrees Fahrenheit.
12:39Step 3.
12:40Remove the front grill from your fan.
12:43Unplug the fan first, always.
12:46Never work on a fan that is plugged in.
12:49Look at the front of your fan.
12:51The plastic front grill usually clips on or screws on.
12:56Locate the clips or screws holding it in place and remove them.
13:01Set the grill aside.
13:02Look at the back of the fan.
13:04You will see the back of the fan blade housing with vent slots that allow air flow through.
13:10This is where the bottles attach.
13:13Step 4.
13:14Attach the frozen bottles to the back of the fan with zip ties.
13:19Position the two frozen bottles upside down behind the fan, with the skinny necks pointing
13:24downward and the wider bottoms pointing upward.
13:27The upside down orientation matters because it keeps the bottles centered behind the fan
13:33blade housing rather than tipping forward.
13:36Run two zip ties around the top of each bottle, which is now the bottom of the upside down bottle,
13:42the narrow neck, and attach them to the vent slots or wire structure on the back of the
13:47fan.
13:48The zip ties go through the fan vents, around the bottleneck, and back through the fan vents,
13:54then snap tight.
13:56Important.
13:57Make sure the bottles do not touch the fan blade.
14:00The fan blade spins behind the back housing.
14:03If the bottle is positioned too close, it will scrape the blade and damage both the fan and
14:09the bottle.
14:11Also important.
14:12Test that the fan still oscillates freely after attaching the bottles.
14:17If the bottles touch the oscillation mechanism, the fan will not turn.
14:22Reposition if needed.
14:25Step 5.
14:26Reattach the front grill, place a towel underneath, and turn the fan on.
14:31Snap or screw the front grill back on.
14:34Place a towel or absorbent cloth on the floor or table directly under the fan to catch condensation
14:40drips.
14:41Turn the fan on at full speed.
14:43Let it run for 5 to 10 minutes.
14:45The cool air begins immediately.
14:48Position the fan to point at the area you want to cool, or set the oscillation to cover the
14:53whole room.
14:54Within 15 to 20 minutes, the room temperature should drop 10 to 15 degrees Fahrenheit from
15:00where it started.
15:01Now, I want to take a moment because here is where the honest scope comes together.
15:06What this method does, plainly, cools a single room of about 12 by 15 feet by 10 to 15 degrees
15:13Fahrenheit.
15:15Lasts 5 to 8 hours per pair of frozen bottles.
15:18Costs $0 to operate beyond the small electricity for the fan.
15:23What this method does not do, plainly, it does not cool an entire house.
15:28It does not match the cooling capacity of a window air conditioner unit.
15:32It does not work for sustained 24 hour cooling.
15:36It does not replace the passive methods from the AC video for general summer comfort.
15:41The honest positioning.
15:43This is a supplementary technique.
15:45For the hottest weeks of summer, when one specific room needs more than passive cooling
15:50can deliver, this method works.
15:52For canning days when the kitchen needs to be sittable during peak heat.
15:56For family room cool down hour before bedtime on a hot night.
16:01For an office or sewing room or workshop that gets uncomfortable during peak afternoon hours.
16:06Small, targeted cooling, not whole house comfort.
16:10The honest math.
16:11A small 12 inch oscillating fan costs $20 to $40 new.
16:16Two 1 liter water bottles cost a few dollars or are free if you reuse bottles from drinks
16:22you already bought.
16:24A bag of table salt costs $2 and lasts for the entire summer.
16:29Total one time investment less than $50 for the full setup.
16:33Compare to a window air conditioner unit $200 to $500 to purchase $30 to $50 per month in
16:40electricity during peak summer $300 to $500 per summer total.
16:45The fan and bottle setup pays for itself in the first three weeks of one summer and continues
16:51running for free year after year.
16:53The bigger value for off-grid families.
16:56A window AC requires significant electricity, typically 8 to 15 amps of constant current,
17:03which strains battery and solar systems severely.
17:06The small oscillating fan draws less than 1 amp.
17:10The frozen bottles provide most of the cooling effect and they cost nothing to make as long
17:15as you have a working freezer or ice box.
17:18There is no money in the air conditioner industry in teaching folks that a $20 fan with two frozen
17:23bottles cools a room as effectively as a $200 window AC for the most stressful hours of summer.
17:31There is a great deal of money in selling families' window AC units, central air installations,
17:36monthly electricity bills, and annual repair contracts every year, forever.
17:41So, the simple old method sits quiet in farm kitchens and off-grid homesteads.
17:47And most American families pay hundreds of dollars per summer for what $20 and a quarter
17:52cup of salt would have given them better.
17:54You can be the one who never paid.
17:57So here is what I want you to do, tonight.
18:00Find a fan you already own or pick one up at any hardware store for under $40.
18:06Save two 1-liter water bottles from drinks you bought this week.
18:10Fill them with water, add ¼ cup of salt to each, shake them up, and place them in the freezer.
18:16Tomorrow afternoon, during the hottest part of the day, pull the frozen bottles out, strap
18:21them to the back of your fan with zip ties, place a towel underneath, and turn the fan on.
18:27Measure the room temperature before and after with a thermometer.
18:31Track what the salt water frozen bottles actually do in your specific room throughout the rest of summer.
18:37Refreeze the bottles every night.
18:40Use the setup whenever the room needs more cooling than the passive methods can provide.
18:45Track what you save by not running your central air conditioning during the peak afternoon hours.
18:50Tell me in the comments below, have you tried the frozen bottle cooling method before, and
18:56which room in your house gets the hottest during summer?
19:00And if your grandparents or great grandparents had their own way of cooling specific rooms
19:05during hot weather, the wet sheets on a clothesline by the window, the basement nap, the corner
19:11of the parlor where everyone gathered because that one spot stayed cool, share the family memory.
19:17The little inherited cooling methods are exactly the kind of knowledge that gets lost when
19:23nobody writes them down.
19:24I read every single one.
19:26Next video.
19:28Since today we covered active cooling for the hottest weeks, the next walks you through
19:33seven cold meals our family eats in summer when the kitchen is too hot to cook.
19:38Pennsylvania Dutch tradition for hot weather food that requires no oven, no stove, no heat
19:45in the kitchen at all.
19:47Eat well without warming the house, on the days when even the fan and bottle setup is fighting
19:52against the kitchen heat.
19:54Subscribe so you do not miss it.
19:56Until then.
19:58Find a fan, save two water bottles, add a quarter cup of salt to each, freeze them overnight,
20:04strap them to the back of your fan with zip ties, place a towel underneath, and remember
20:09that the same air cooling principles that physics textbooks teach in chemistry class also make
20:15a kitchen sittable on the worst afternoon of July for the price of one bag of salt and
20:21a quarter hour of work.
20:23That is how the careful old folks got through hot summers before central air conditioning
20:27sold them comfort by the monthly bill.
20:29That is how it is still done in any house that remembers.
Comments