Climate & Comfort
Professional van heater installation, AC systems, powered ventilation, aftermarket windows, and privacy covers — engineered to keep you comfortable in every season, every climate, every altitude.
Why Van Climate Control Changes Everything
A van without climate control is a vehicle with limitations. You can't camp in the Rockies in October without a heater. You can't work remotely from the Texas coast in July without air conditioning. You can't sleep comfortably anywhere without ventilation. Climate is the system that turns a cargo van into a place you can actually live — not just survive in, but live in comfortably, productively, and without constantly checking the weather forecast before you commit to a destination.
At OZK Customs, we approach van climate control as an integrated engineering problem — not a parts list. Your heater placement affects your electrical load. Your AC unit determines your battery bank sizing. Your fan cutout location determines your solar panel layout. Your window configuration determines your natural ventilation and light. Your window covers determine your thermal insulation and privacy. Every component in the climate system interacts with every other component, and getting one wrong creates compromises that ripple through the entire build.
We install climate systems on all three major van platforms — Ford Transit (2015+), Mercedes Sprinter (2019+), and Ram ProMaster (2022+). Every product on our menu has been tested across dozens of completed builds, and every installation follows documented procedures that account for the specific mounting points, wiring routes, and integration requirements of each platform. This isn't generic van work. It's platform-specific engineering backed by real installation experience.
AC & Ventilation Systems
Cooling a van is one of the hardest problems in the upfit world. You're fighting metal walls that absorb and radiate heat, limited electrical capacity, and a living space with almost no thermal mass. The right solution depends entirely on how you use your van — whether you're plugged into shore power at campgrounds, running off a battery bank at dispersed sites, or need a system that does both heating and cooling from a single unit.
The GREE EcoCool 15K BTU is our shore-power and generator AC solution — a powerful 120V unit that delivers serious cooling capacity when you have access to external power. At 15,000 BTU, the EcoCool can handle even the hottest conditions in the largest van configurations. It's the right choice for customers who primarily camp at sites with electrical hookups or run a generator for extended stays.
For off-grid cooling, the Velit 2000R runs on 12V power directly from your battery bank — no inverter, no shore power, no generator required. It's compact, efficient, and purpose-built for the electrical constraints of a van system. The OutEquip Pro takes a different approach entirely: a 12V heat pump that both heats and cools from a single unit, making it the most versatile climate option in our lineup. And the MaxxAir Fan Deluxe remains the foundation of every ventilation system we install — a thermostat-controlled roof vent fan with powered intake and exhaust, built-in rain cover, and the reliability that has made it the industry standard for van ventilation.
GREE EcoCool 15K BTU
120V shore/generator AC with 15,000 BTU of cooling power. Maximum cooling capacity for campground and hookup use. Handles the hottest conditions in any van configuration.
Velit 2000R
12V battery-powered compact AC — no inverter or shore power needed. Purpose-built for off-grid van use with efficient power draw from your lithium battery bank.
OutEquip Pro Heat Pump
12V heat pump that heats AND cools from a single unit. The most versatile climate option available — dual-function performance without doubling your equipment.
MaxxAir Fan Deluxe
Thermostat-controlled roof vent fan with powered intake and exhaust modes. Built-in rain cover for all-weather operation. The industry standard in van ventilation.
Van Heater Installation
A diesel or gasoline heater is the single most important comfort upgrade you can make to a van. It's the difference between abandoning a trip when temperatures drop and sleeping comfortably through a 15°F night in the mountains. Unlike portable propane heaters that produce moisture, require ventilation, and carry safety risks, a professionally installed Espar or Webasto heater draws fuel directly from your van's tank, vents combustion gases outside the vehicle, and draws minimal electrical power — often less than your phone charger.
The Espar Airtronic S3 D2L is our most popular heater installation for Mercedes Sprinter vans — a diesel-specific unit that taps directly into the Sprinter's fuel system with a dedicated kit engineered for that platform. For Ford Transit and Ram ProMaster owners running gasoline engines, the Espar Airtronic S3 B2L gasoline kit provides the same whisper-quiet, efficient forced-air heating with fuel pickup designed for gasoline fuel systems. Both units deliver thermostatically controlled heat that maintains your set temperature throughout the night without intervention.
For customers who want heated water in addition to cabin heat, the Espar Hydronic is a water-based heating system that can simultaneously heat the living space and provide hot water — a dual-purpose solution that eliminates the need for a separate water heater. The Webasto Air Top 2000 STC rounds out our gasoline heater options as an alternative to the Espar B2L, offering proven European engineering and a long track record in the overlanding community. Every heater we install includes proper fuel line routing, combustion exhaust venting, electrical integration with your house battery system, and a controller that you can operate from the comfort of your bed.
Espar Airtronic S3 D2L — Diesel Sprinter Kit
Diesel-specific forced-air heater with a dedicated Sprinter fuel pickup kit. Our most popular heater for Mercedes Sprinter builds. Near-silent operation, minimal electrical draw.
Espar Airtronic S3 B2L — Gasoline Kit
Gasoline forced-air heater for Ford Transit and Ram ProMaster. Same proven Espar engineering adapted for gasoline fuel systems. Thermostatically controlled cabin heat all night.
Espar Hydronic
Water-based heating system that heats both cabin air and water simultaneously. Dual-purpose climate and hot water from a single fuel-fired unit — eliminates the need for a separate water heater.
Webasto Air Top 2000 STC — Gasoline Kit
Proven European gasoline heater with a long track record in the overlanding community. An alternative gasoline option with reliable performance and straightforward integration.
Aftermarket Van Windows
Cargo vans ship from the factory with blank metal panels where windows should be. Adding aftermarket windows transforms the interior from a dark metal box into a living space with natural light, cross-ventilation, and views that make the van feel twice its actual size. But cutting holes in your van is permanent — and doing it wrong means water leaks, structural compromise, and warranty issues. Professional window installation means precision cutting, proper sealing, and integration with your van's existing drainage channels and structural ribs.
Our most popular window installation is the 2nd Row Sliding Window set — driver and passenger side windows that provide natural light and sliding ventilation to the primary living area. These windows are designed to fit the factory panel locations on Transit, Sprinter, and ProMaster platforms with proper sealing and trim. Rear Cargo Door Windows add light and visibility to the back of the van, turning the cargo doors from solid walls into functional portals.
For bunk-area configurations, we offer two styles: Sliding Bunk windows provide ventilation with a horizontal slide mechanism, while Awning Bunk windows hinge outward from the bottom for rain-friendly airflow — you can leave them cracked in a drizzle without water intrusion. Every window installation includes marine-grade sealant, proper trim, and integration with your wall panel system so the finished result looks like it came from the factory, not an afterthought.
2nd Row Sliding Windows
Driver and passenger side sliding windows for the primary living area. Natural light, cross-ventilation, and platform-specific fitment for Transit, Sprinter, and ProMaster.
Rear Cargo Door Windows
Aftermarket windows for the rear cargo doors. Add light and visibility to the back of the van with proper sealing and factory-quality fitment.
Sliding Bunk Windows
Horizontal-slide windows for bunk area configurations. Smooth operation, secure locking, and ventilation control for sleeping areas.
Awning Bunk Windows
Bottom-hinged awning windows that open outward for rain-friendly airflow. Leave them cracked in wet weather without water intrusion.
Window Covers & Screens
Windows solve the light and ventilation problem, but they create new ones: privacy, thermal loss, and insects. Anyone who has tried to sleep in a van with uncovered windows in a Walmart parking lot — or woken up in a sweat because morning sun turned the interior into a greenhouse — understands why window covers aren't optional. They're a critical layer in the climate system.
VanEssential Stealth covers are our primary window cover solution, available for Ford Transit, Mercedes Sprinter, and Ram ProMaster with full platform coverage. These are precision-cut, magnetic-mount blackout covers that provide complete privacy and meaningful thermal insulation. They install and remove in seconds, store flat when not in use, and fit with a precision that generic cut-to-fit solutions can't match. The difference between platform-specific covers and universal covers is the difference between a window shade and a piece of cardboard — both block light, but only one looks and performs like it belongs.
BugWall Screens provide insect protection for open windows and doors across all three platforms — Transit, Sprinter, and ProMaster. When you want airflow without mosquitoes, BugWall lets you run your MaxxAir fan and open your windows without turning the interior into a bug habitat. For customers who want a combined shade and screen solution, the Wanderful StealthShade and Hideaway systems offer integrated privacy covers with bug screen functionality in a single product. Every cover and screen we install is platform-specific and measured for your exact window configuration.
VanEssential Stealth Covers
Precision-cut magnetic blackout covers for Transit, Sprinter, and ProMaster. Complete privacy, thermal insulation, and seconds-fast installation. Full platform coverage available.
BugWall Screens
Insect protection for open windows and doors across all three platforms. Run your fan and open windows without bugs. Platform-specific fitment for Transit, Sprinter, and ProMaster.
Wanderful StealthShade / Hideaway
Combined shade and screen systems — integrated privacy covers with bug screen functionality in a single product. Clean installation with dual-purpose performance.
Build Your Climate System
Every climate system starts with understanding how you use your van. Tell us your travel style, your van platform, and the conditions you need to handle — and we'll engineer a climate package that keeps you comfortable year-round.
Why Professional Climate Installation Matters
Safety First
Heater installation involves fuel line routing, combustion exhaust venting, and electrical integration. A misrouted exhaust or improperly sealed fuel connection isn't a warranty issue — it's a safety hazard. Our installations follow manufacturer specifications with documented procedures for every connection point.
System Integration
Your heater, AC, fan, and windows are all part of one climate system — and they share electrical, structural, and airflow resources with every other system in the van. Professional installation means every component is planned together, wired correctly, and sized for the actual load it carries.
Warranty Protection
Espar, Webasto, GREE, and MaxxAir all require professional installation for full warranty coverage. A DIY install that fails voids the manufacturer warranty on the unit AND can void your vehicle warranty if the installation caused the damage. Our documentation protects both.
Platform Expertise
Transit, Sprinter, and ProMaster each have different mounting points, wiring routes, fuel system access points, and roof structures. We don't install climate systems generically — we install them with platform-specific knowledge from hundreds of completed builds across all three vans.
The Installation Process
Climate Consultation
We discuss your travel patterns, van platform, electrical capacity, and comfort priorities. Desert summers? Mountain winters? Year-round full-timing? The answers drive your system design.
System Engineering
We map your climate components against your electrical system, roof layout, and interior build plan. Every placement is planned before the first cut — no conflicts, no compromises.
Professional Install
Heater fuel lines routed and sealed. AC units mounted and wired. Fan cutouts precision-cut. Windows installed with marine-grade sealant. Every connection documented and tested.
Testing & Walkthrough
Every climate component is run through full operating cycles. Heater burn-in completed. AC performance verified. Fan operation tested. You get a complete walkthrough of every system and control.
Climate installs can be done standalone or as part of a complete upfit package — ask during your consultation.