How to Choose Truck Parking AC — 7-Step Sizing Guide

• Table of Contents

1. Step 1 — Voltage: 12V or 24V?
2. Step 2 — Cooling capacity by cab volume
3. Step 3 — Battery sizing for target runtime
4. Step 4 — Refrigerant: R410A or R32?
5. Step 5 — Mounting: rooftop, side or back wall?
6. Step 6 — Climate range — heat pump needed?
7. Step 7 — Warranty and service support
8. Get a personalized sizing recommendation

Choosing the right parking AC depends on seven decisions: voltage, cooling capacity, battery sizing, refrigerant type, mounting location, climate range and warranty. Following this checklist prevents the two most common procurement mistakes (undersized cooling and undersized battery) that lead to driver complaints and warranty claims.

Step 1 — Voltage: 12V or 24V?

12V: vans, camper conversions, smaller RVs, light commercial vehicles. 24V: Class 8 trucks, large motorhomes, heavy equipment, some European medium-duty trucks. Match the vehicle's existing house/auxiliary battery voltage. Mixing voltages requires DC-DC converter which adds cost and inefficiency.

Step 2 — Cooling capacity by cab volume

Cab volume <5 m³ (sleeper berths, small camper vans): 2.0–2.4 kW (ZH 1000). Cab volume 5–10 m³ (Class 8 sleeper, Sprinter conversion): 2.4–2.6 kW (VS02 PRO, ZH 1000 24V). Volume 10–18 m³ (Class C motorhome, large camper): 2.6–3.0 kW (VC 1000). Volume 18+ m³ (Class A motorhome): 3.0+ kW (VC 2000) or dual unit installation.

Step 3 — Battery sizing for target runtime

Target hours × continuous Ah draw = required usable Ah. LiFePO4: usable ≈ nameplate × 0.9. AGM: usable ≈ nameplate × 0.5. Example: 8 hours × 28A = 224 Ah usable. LiFePO4 = 250 Ah nameplate. AGM = 450 Ah nameplate. LiFePO4 is dramatically lighter and more compact.

Step 4 — Refrigerant: R410A or R32?

R410A: cost-effective, globally available, EPA/CARB compliant in most jurisdictions through 2030+ for installed equipment. R32: 68% lower GWP, EU 2026+ regulatory preference, ~$50–$100 premium per unit. Choose by destination market regulatory schedule.

Step 5 — Mounting: rooftop, side or back wall?

Rooftop (standard 360×360 mm cutout): best airflow, easy install on flat roof. Side-wall: required on some heavy equipment with no roof access. Back-wall: less common, used on some buses and emergency vehicles. Vethy supports all three configurations — specify mounting style on order.

Step 6 — Climate range — heat pump needed?

Cooling-only adequate for tropical / subtropical fleets (Mexico, GCC, ASEAN, US Sun Belt). Heat pump bonus extends use to shoulder seasons in temperate climates (UK, Germany, US Midwest, China). All Vethy models include reversible heat pump standard at no extra cost.

Step 7 — Warranty and service support

Vethy: 2 years parts warranty. US distributor stocks full BOM with 24–48 hour dispatch. EU and Australia distributors similar. Service performed by any certified mobile HVAC tech. Verify before purchase: local parts availability, install partner network, English-language tech support hours.

Get a personalized sizing recommendation

Email sales@vethy.com or call +86-532-87729918 for spec sheets, ROI worksheets and CIF pricing within 24 hours. Provide vehicle type + cab volume + target overnight hours + climate region — we recommend a complete kit specification with TCO worksheet.

Frequently asked questions

Is bigger always better for cooling capacity?

No. Oversized AC cycles too quickly, reducing efficiency and comfort. Match capacity to cab volume per Step 2.

Can I retrofit a roof-mount on a truck that already has an OEM HVAC?

Yes. Parking AC operates independently of main engine HVAC. Most fleets install both: engine HVAC for drive time, battery parking AC for parked/sleep time.

How long does typical install take?

Class 8 sleeper cab: 6–8 hours. Camper van: 4–6 hours. Motorhome (single unit): 4–6 hours. Heavy equipment: 6–8 hours. Most installers complete in one workday.

Do I need certified install or can I DIY?

DIY possible with mechanical aptitude. Refrigerant circuit is sealed and pre-charged from factory — no refrigerant handling required. Pro install recommended for warranty and electrical safety.