HVAC prices in three bands. Diagnosis: $75 to $200 for the visit that names the failure with readings. Repairs: most single components land between $150 and $650, capacitors and contactors at the low end, blower and fan motors in the middle, refrigerant leak repair and compressors above the band entirely. Replacement: $5,000 to $12,500 or more installed for a full system in published national guides.
San Marcos costs carry an age footnote the national guides do not print: this market still runs units over 40 years old, per a ranking dealer's own record. For those systems, repair money is priced against a replacement horizon measured in seasons, not decades. Ask for any major repair quote to state the system's age and the next likely failure in writing; on a young system that is diligence, on a 40 year system it is the whole decision.
The variables that move a quote are measurable: system size, efficiency tier, fuel, duct condition, and access. The duct variable deserves its reputation: two quotes $3,000 apart on the same house usually differ in whether the ducts were actually inspected.
Emergency timing is the honest surcharge: after hours and heat wave calls price higher across the whole market, stated before dispatch by any company worth hiring. A tune up at $75 to $200 in the shoulder season is the cheapest sentence in this guide; it finds the capacitor in April that would have stranded the system in July.
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