A mining container that supports its full miner count at a 77°F (25°C) factory test can lose that capacity quickly when the outdoor temperature reaches 105°F, the filters are partially loaded with dust, and hot exhaust air is being pulled back into the intake.

That is the real conflict behind a Texas bitcoin mining container project.

Texas heat does not simply increase fan speed. It reduces the available thermal margin between outdoor air and the miner’s maximum permitted inlet temperature. Once that margin disappears, the operator must choose between reducing miner power, accepting thermal alarms, or shutting down part of the load.

NOAA reported that Del Rio and Rio Grande reached 113°F, while San Angelo reached 114°F during June 2023. Those temperatures should change how buyers evaluate airflow, filtration, evaporative cooling and site layout.

A Texas-ready container must be designed for the worst credible operating condition, not the annual average.

Texas Is Not One Cooling Environment

A hot climate mining container in West Texas does not face the same cooling conditions as one near Dallas, Houston or the Gulf Coast.

Direct evaporative cooling normally performs better in dry conditions because the difference between dry-bulb and wet-bulb temperature is larger. As humidity rises, that difference becomes smaller, leaving less room for a water curtain to reduce the supply-air temperature.

For this reason, a supplier should never describe a water curtain with a fixed claim such as “10°C cooling” without stating the entering dry-bulb temperature, wet-bulb temperature, pad efficiency and airflow.

Pro Tip: Request summer design conditions for the exact project location or ZIP code. “Texas climate” is not a valid thermal design input.

Start With Miner Inlet Temperature, Not Weather-App Temperature

The miner does not experience the temperature displayed on a weather application. It experiences the air that actually reaches its intake.

A useful simplified relationship is:

Miner inlet temperature ≈ outdoor dry-bulb temperature − evaporative cooling effect + solar and recirculation gain

Assume the outdoor temperature is 109°F (43°C). If the water curtain provides an 8°C reduction but solar heat and exhaust recirculation add 4°C, the miner inlet temperature is approximately 39°C.

Now assume higher humidity reduces the evaporative effect to only 3°C. Under the same site conditions, the inlet temperature rises to approximately 44°C.

That one change can place the miner close to its operating-temperature limit.

BITMAIN lists an inlet operating-temperature range of -20°C to 45°C for the S21 Pro. It also states that, between 900 and 2,000 meters of altitude, the maximum operating temperature decreases by 1°C for every 300-meter increase.

This does not mean every ASIC model has the same limit. The exact miner specification, firmware behavior and power mode must be confirmed before container design is frozen.

Calculate the Heat Load Before Selecting the Fans

Almost all electrical power consumed by ASIC miners eventually becomes heat. Therefore, a 1.3 MW IT load requires the container to remove approximately 1.3 MW of heat continuously.

A simplified air heat-balance equation is:

Q = ρ × cp × V̇ × ΔT

Where:

• Q = heat load

• ρ = air density

• cp = specific heat capacity of air

• V̇ = airflow

• ΔT = temperature rise between supply and exhaust air

Using approximate sea-level values:

Required airflow ≈ Heat load ÷ (1.2 × 1.005 × ΔT)

For a 1.3 MW air-cooled container:

These are simplified heat-balance calculations, not final fan-selection values.

Real fan selection must also account for altitude, air density, filter resistance, louvers, evaporative pads, miner resistance, leakage, wind pressure, fan curves and hot-air recirculation.

An ACT reference 40HC air-cooled configuration has previously been designed around approximately 1,300 kW of operating power, 16 large exhaust fans and capacity for up to approximately 336 S19/S21-class miners or 270 S21 XP-class miners.

However, those figures describe a reference configuration. They do not guarantee the same miner capacity under every Texas climate, altitude, dust level or site layout.

Fan Airflow Is Not the Same as System Airflow

A fan catalog may show a high airflow value under free-air conditions. Once the fan is installed in a mining container, it must pull air through multiple restrictions:

• Rainproof louvers

• Insect screens

• Clean or dirty filters

• Evaporative-cooling pads

• Miner racks

• Cables and structural supports

• Internal pressure zones

• Exhaust openings

Each component creates static-pressure loss. As pressure increases, the actual airflow delivered by the fan normally decreases according to its performance curve.

This is why selecting fans only by their maximum free-air airflow can create a container that looks powerful on paper but underperforms after installation.

The RFQ should request the expected system operating point, including airflow and static pressure. Buyers should also ask for both clean-filter and dirty-filter conditions.

Pro Tip: Ask the supplier to model one failed fan combined with partially loaded filters. A hot climate mining container should not depend on every fan and every filter remaining in perfect condition.

Hot-Air Recirculation Can Destroy the Cooling Margin

More airflow will not solve the problem if the container keeps pulling its own exhaust air back into the intake.

Recirculation commonly appears when:

• The intake and exhaust sides are too close

• Several containers discharge toward one another

• A wall or sound barrier traps hot air

• Containers are installed too close together

• Prevailing wind pushes exhaust toward the intake

• The exhaust plume cannot rise or disperse

• Air leaks around racks instead of passing through miners

A container may receive 104°F outdoor air on one side and 113°F recirculated air at part of the intake. One room-level sensor will not reveal that difference.

Temperature sensors should be installed at representative miner inlets across the container, including the upper, middle and lower rack positions and the zones closest to each end.

Smoke testing, thermal imaging and multi-point temperature logging should be included during commissioning when site geometry creates recirculation risk.

Water Curtains Must Be Sized by Wet-Bulb Conditions

A water curtain does not produce a fixed supply-air temperature. Its performance depends on the entering dry-bulb temperature, wet-bulb temperature and saturation efficiency.

A simplified calculation is:

Supply temperature = dry-bulb temperature − effectiveness × (dry-bulb temperature − wet-bulb temperature)

For example, with 80% pad effectiveness:

• At 43°C dry bulb and 24°C wet bulb, the theoretical supply temperature is approximately 27.8°C.

• At 43°C dry bulb and 30°C wet bulb, the theoretical supply temperature increases to approximately 32.6°C.

Solar gain, fan heat, air leakage and recirculation can push the actual miner inlet above these theoretical values.

Water quality matters as well. Hard water and high mineral content can create scaling on the pads, reducing both cooling effectiveness and airflow. Poor distribution can leave dry sections, while excessive water can increase carryover and pressure drop.

A Texas RFQ should therefore include:

• Design dry-bulb and wet-bulb temperatures

• Pad efficiency and pressure drop

• Water consumption at design conditions

• Water-quality requirements

• Filtration and blowdown strategy

• Pump redundancy

• Low-water and pump-failure alarms

• Pad replacement and cleaning access

Pro Tip: If the thermal model only works with a perfectly clean pad at its maximum stated efficiency, the system does not have enough operating margin.

Dust Control Is Part of Thermal Design

Texas mining sites may experience dust from unpaved roads, construction, agriculture and strong winds. Dust is not only a maintenance issue. It directly changes thermal performance.

As filters load, static pressure rises and system airflow falls. Dust deposited on miner heat sinks increases thermal resistance. At the same time, blocked evaporative pads can reduce cooling effectiveness.

The filter system should be evaluated using three conditions:

1. New and clean

2. Normal operating pressure drop

3. Replacement or alarm pressure drop

Differential-pressure sensors are more useful than a replacement schedule alone because dust loading changes with season, traffic and weather.

Filter access must also allow maintenance without exposing operating miners to unfiltered bypass air.

Derating Must Be a Planned Control Mode

Derating should not begin with miners entering thermal protection unexpectedly.

A practical hot-weather control sequence can include:

1. Increase ventilation as inlet temperature rises.

2. Activate the evaporative-cooling system when wet-bulb conditions support it.

3. Issue a warning before the miner temperature limit is reached.

4. Reduce miner power or frequency in controlled stages where supported.

5. Shed selected groups instead of tripping the full container.

6. Preserve ventilation after load reduction to remove stored heat.

7. Restart miners in stages after conditions recover.

Staged control also protects the electrical system. Restarting hundreds of miners simultaneously after a grid event or thermal shutdown can create unnecessary electrical stress.

The control system should record inlet temperature, exhaust temperature, differential pressure, fan status, water-system status, power and alarm history. Without this data, operators cannot determine whether lost hashrate came from weather, dirty filters, failed fans or recirculation.

Summer Cooling Power Changes the Usable IT Capacity

Higher fan speed, additional pumps and water-treatment equipment increase auxiliary power consumption.

If a 1.3 MW IT load requires an additional 20 kW of cooling and control power during extreme heat, the simplified PUE impact is:

20 kW ÷ 1,300 kW = approximately 0.015 PUE

That may appear small, but it matters when the transformer, switchgear or utility connection has a fixed capacity. Extra cooling power can reduce the electrical headroom available to the miners.

Outdoor electrical equipment must also be checked for its ambient-temperature rating. Transformers, switchboards, variable-frequency drives, cables and control cabinets exposed to direct solar radiation may experience conditions higher than the reported outdoor air temperature.

Shade structures, cabinet ventilation and appropriate equipment ratings should be considered during site engineering.

Texas Heat and Grid Risk Can Occur at the Same Time

ERCOT reported ten new all-time peak-demand records during the summer of 2023, including an approximately 85.5 GW peak on August 10.

The hottest hours can therefore overlap with high grid demand, elevated electricity prices or requests for load reduction.

A mining project’s operating plan should answer:

• Can the cooling system remain active while miner load is curtailed?

• How quickly can the container reduce electrical load?

• Can miners restart in controlled groups?

• Will control systems and network equipment remain powered?

• How is thermal soak handled after a sudden shutdown?

• Does the revenue model include summer curtailment hours?

A container with strong nominal capacity but poor restart and curtailment logic can lose more production than a slightly lower-density system with stable controls.

Calculate ROI From Lost Hashrate, Not Container Price Alone

The cheapest container is not necessarily the lowest-cost deployment.

Heat-related exposure can be estimated with:

Lost hashrate exposure = affected miner count × hashrate per miner × derating hours

Alternatively:

Heat-related revenue exposure = curtailed MW × expected contribution per MW-hour × curtailment hours

Because hashprice and electricity prices change, buyers should insert their own operating assumptions instead of relying on a fixed revenue number from the equipment supplier.

The ROI comparison should include:

• Additional fan and filtration CAPEX

• Evaporative-cooling equipment

• Water treatment and consumption

• Filter and pad replacement

• Auxiliary electricity

• Planned summer derating

• Unplanned shutdown hours

• Miner cleaning and repair

• Lost hashrate during thermal events

Spending more on sensors, fan margin, filtration and airflow separation can be justified if it prevents repeated high-temperature curtailment.

Pro Tip: Compare designs by expected annual delivered hashrate, not installed miner count. Installed capacity does not produce revenue while it is thermally limited or offline.

Texas Mining Container RFQ Checklist

Before requesting a final quotation, the buyer should provide:

• Exact project location or ZIP code

• Site elevation

• Miner model, quantity and power mode

• Total IT load

• Available voltage and transformer capacity

• Design dry-bulb and wet-bulb temperatures

• Maximum acceptable miner inlet temperature

• Expected dust conditions

• Site layout and container spacing

• Prevailing wind direction

• Water availability and water-quality report

• Noise restrictions

• Utility curtailment requirements

• Required redundancy level

• Target summer derating limit

The supplier should return:

• Heat-load calculation

• Required system airflow

• Fan operating point and pressure budget

• Clean and dirty-filter performance

• Water-curtain design conditions

• Estimated water consumption

• Fan-failure response

• Sensor and alarm list

• Control and derating sequence

• Site-layout recommendations

• Factory Acceptance Test plan

• Commissioning procedure

Procurement Verdict: Buy Thermal Margin, Not Brochure Capacity

A Texas bitcoin mining container should not be approved simply because it can physically hold the required number of miners.

It should be approved only when the supplier demonstrates that acceptable miner inlet temperatures can be maintained under the project’s design-day conditions, realistic filter loading, expected humidity, site wind conditions and defined equipment-failure scenarios.

For dry West Texas locations, air cooling with well-designed filtration and evaporative assistance may offer strong operating economics. In Central or North Texas, wet-bulb conditions and recirculation margin require closer attention. Near the Gulf Coast, high humidity may make pure evaporative assistance less dependable during critical hours, which can justify hybrid or liquid-cooling evaluation.

Go air-cooled when the thermal model supports it.

Add operating margin when the model is close to the miner limit.

Consider liquid cooling when the project requires high density, predictable summer output or reduced dependence on outdoor humidity.

To evaluate a site-specific solution, review the Air Cooling Mining Container or contact the ACT engineering team with your miner model, quantity, power capacity, location and summer operating target.

FAQ

Can an air-cooled mining container operate in Texas?

Yes. However, its capacity must be verified using the site’s summer dry-bulb and wet-bulb temperatures, dust conditions, altitude, miner specification and container layout.

Does a water curtain solve the Texas heat problem?

Not by itself. It can be effective in dry conditions, but its cooling capacity decreases as wet-bulb temperature rises. Pad pressure drop, water quality and maintenance must also be included.

What is the most important temperature for ASIC miners?

The temperature at the miner inlet is more important than the general outdoor or container-room temperature.

How can buyers reduce ASIC derating risk?

Provide sufficient system airflow, control recirculation, monitor inlet temperatures, maintain filters and pads, and use staged power-control logic before the miner reaches its operating limit.

Is liquid cooling always better for Texas?

Not always. Air cooling can remain cost-effective at suitable sites. Liquid cooling becomes more attractive when density, dust, noise, humidity or predictable high-temperature output is the primary requirement.