I would not encourage you to have a Renault car in Doha. I have a Renault Meggane and let me tell you that it is not worth it for the following reasons:

1. Spare parts : very expensive

2. You are right AC is not strong enough

3.Most people [if not all] do not know about these cars [not even how to replace a bulb!], you have to go to Renault, although the service is good but the prices are sky high

4. Very difficult to sell the car in Doha