1 CostHelper readers report costs of $1,000-$3,700 for major air conditioning repairs, with an average of $1,829. 2  Installing air conditioning in a vehicle that doesn't have any can cost $1,500-$4,000 or more, depending on location and the vehicle's year, make and model; luxury vehicles can cost even more. This generally includes replacing a few parts like hoses, sensors, or either the compressor or condenser. 2  CostHelper readers report paying $171-$727 for minor air conditioning repairs, at an average cost of $488.
TTL stands for Through The Lens, and in the case of SLR metering, it indicates how the light is measured--that it's the light coming through the taking lens, rather than, say, an exterior sensor.
1 TTL is part of the Domain Name System. 2  TTLs are set by an authoritative nameserver for each resource record.  TTLs are used for caching purpose. For example, www.dnsknowledge.com TTL value is 86400 seconds, which is 24 hours. The higher a recordâs TTL, the longer the information will be cached, and the less queries a client will have to make in order to find the domain.