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How to cool down a car or motorhome without air conditioning

15.07.2026 13:57 1 min 1 source
merkur.de DEU

External sunshades for the windshield reduce interior temperature by up to 8 degrees Celsius compared to an unprotected vehicle, according to a 2021 ADAC test. Internal shades are less effective, cooling by only 4 degrees. A full vehicle cover can lower the temperature by up to 10 degrees.

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How to cool down a car or motorhome without air conditioning

15.07.2026 merkur.de DEU Original source

🇩🇪 Germany — fuel prices

Updated: 11.07.2026

Super E10

$2.35 /l

€2.06 · £1.76/l

127 of 133

pricier than 95% of countries

Super Plus 98

$2.43 /l

€2.13 · £1.82/l

86 of 92

pricier than 92% of countries

Diesel

$2.25 /l

€1.97 · £1.68/l

124 of 134

pricier than 92% of countries

Premium Diesel

$2.56 /l

€2.24 · £1.91/l

39 of 41

pricier than 93% of countries

LPG

$1.28 /l

€1.12 · £0.95/l

48 of 51

pricier than 92% of countries

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Interior temperatures in a motorhome can exceed 40°C when parked in direct sunlight. External insulation mats are more effective than internal ones because they reflect sunlight before it reaches the windshield, preventing the cabin and dashboard from heating up. Internal mats are less effective as the glass still heats up and transfers heat inside. Universal mats start at around 20–30 euros, while custom-fit external mats cost between 80 and 200 euros.

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