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Humidity, Temperature, and the Great Humidor Debate
Does Lowering Temperature Actually Lower Humidity?
If you’ve spent more than ten minutes in an online cigar forum, you’ve seen this argument.
One guy says:
“If you want to lower the humidity, just lower the temperature.”
Another guy says the opposite.
Then someone drops this bomb:
“It’s called VPD. The higher the temperature, the lower the humidity. The higher the humidity, the lower the temperature.”
Now everybody’s arguing. Charts get posted. Feelings get hurt. Somebody threatens to buy a new hygrometer.
So let’s settle this the blue-collar way.
Not with bro science.
Not with ego.
With real physics that actually makes sense.
First, Let’s Clear Something Up
Temperature does not directly control humidity.
Let that sink in.
Temperature affects how humidity is measured, but it does not magically add or remove moisture from the air.
That difference is where most of the confusion starts.
The Two Types of Humidity Nobody Explains Properly
There are two things happening inside your humidor:
1. Absolute Humidity
This is the actual amount of water vapor in the air.
Think of it like this.
If you poured a specific amount of water into the air and could weigh it, that would be absolute humidity.
It is the real, physical amount of moisture present.
2. Relative Humidity
This is what your hygrometer reads.
Relative humidity is a percentage. It tells you how full the air is compared to how much it could hold at that temperature.
And here is the key:
Warm air can hold more moisture than cold air.
That one sentence explains almost everything.
What Actually Happens When You Change Temperature
Let’s say your humidor is sitting at:
- 70°F
- 69% RH
You do not add water. You do not remove water.
Now you raise the temperature to 75°F.
What happens?
The amount of moisture in the air stays exactly the same. You did not add or remove any.
But warm air can hold more moisture.
So now that same amount of water vapor makes up a smaller percentage of the air’s total capacity.
Your hygrometer drops.
Not because moisture disappeared.
But because the air’s capacity increased.
Now flip it.
Lower the temperature to 65°F without changing the moisture.
Cool air holds less moisture.
That same amount of water vapor now represents a higher percentage of capacity.
Your hygrometer reading goes up.
That’s it.
That’s the whole trick.
So, Who Is Technically Right in the Forum?
The guy saying:
“Higher temperature equals lower humidity.”
He is partially correct, but only regarding relative humidity readings.
The guy saying:
“Lower temperature to lower humidity.”
He is wrong.
Lowering the temperature will actually increase relative humidity if the moisture stays constant.
But here’s the bigger truth:
Neither of them is actually solving humidity issues correctly in a humidor.
Now Let’s Talk About VPD
VPD stands for Vapor Pressure Deficit.
It is a measurement used in agriculture and plant science. It describes how aggressively the air pulls moisture from a surface.
Farmers and greenhouse growers use it to control plant transpiration.
It absolutely involves temperature and humidity working together.
And yes, technically speaking, higher temperatures increase vapor pressure differences and alter rates of moisture movement.
But here’s the thing.
You are not growing tomatoes in your humidor.
You are storing finished, cured tobacco in a sealed environment.
Different application.
Different goal.
VPD is real science. It is just being misapplied in cigar storage arguments.
What Actually Happens Inside a Humidor
Here is where it gets interesting.
Cigars are hygroscopic. That means they constantly absorb and release moisture.
If you raise the temperature and your RH drops, your cigars and your humidification system will respond.
If you use Integra Boost moisture packs, they are two-way humidity regulators.
If RH drops, they release moisture.
If RH rises, they absorb moisture.
The system rebalances.
So while temperature changes may temporarily shift the RH reading, your humidor is a dynamic system. It adjusts.
That is why you do not control humidity by playing with temperature.
You control humidity by controlling moisture.
The Blue Collar Comparison
Trying to control humidity by changing temperature is like trying to adjust tire pressure by changing the outside air temperature.
Yes, pressure changes with temperature.
But if your tire is low, you add air.
You do not move the car into the shade and hope physics fixes it.
Same concept.
If your humidor is too humid, you reduce the moisture.
If it is too dry, you add moisture.
You do not treat temperature as your primary adjustment tool.
Why Stability Matters More Than the Exact Number
Here is the part most guys miss.
Your cigars do not care if they are at 67% or 69%.
They care about consistency.
Big swings cause:
- Wrapper cracking
- Uneven burns
- Tunneling
- Canoeing
A stable 68% at 70°F is better than bouncing between 63% and 72% all week.
Chasing numbers causes more problems than solving them.
So What Should You Actually Do?
For long-term cigar storage:
- 65% to 70% relative humidity
- 65°F to 72°F temperature
- Minimal fluctuations
If humidity is too high:
- Reduce humidification
- Use fewer Integra Boost packs
- Allow slight airflow temporarily
If humidity is too low:
- Add properly sized humidity packs
- Check your humidor seal
Temperature is for preventing beetles and extreme conditions.
Moisture control is for humidity management.
The Final Word
Temperature affects relative humidity readings.
It does not control moisture content.
Lowering the temperature will increase the RH if the moisture stays the same.
Raising the temperature will decrease RH if the moisture stays the same.
VPD is real science, but it is mostly relevant in plant cultivation, not cigar storage.
In a humidor, moisture management and stability win every time.
You do not need to overthink it.
You need:
A good seal.
A reliable hygrometer.
A proper humidification system.
And the discipline not to panic every time the number moves 1 percent.
Keep it stable.
Keep it simple.
Light it up.
