My 1980s Mira Mesa AC is loud and inefficient, is replacement worth it?
Almost always yes. A typical 1980s 8-10 SEER AC unit uses roughly twice the energy of a modern 18-20 SEER heat pump for the same cooling output. In Mira Mesa with its 9-10 month meaningful cooling season, that's typically $1,000 to $2,000 in annual energy waste compared to modern equipment. When rebate programs have open funds they cover a real share of replacement cost; we confirm current SDG&E and TECH Clean California status at quote time. Modern variable-speed heat pumps also run substantially quieter than the original equipment, which matters in the dense Mira Mesa lot sizes where neighbor proximity is close. Most homeowners see 6-9 year payback on energy alone.