When three contractors quote a new system, almost everyone picks the lowest number on the proposal. That number is the install price. It is not what the system will cost you.
Over 15 years in a Glendora or San Gabriel Valley home, energy usually beats the equipment bill. Repairs and skipped maintenance decide whether you get 12 years or 18. The install price is just the down payment.
The four numbers that actually matter
Total cost of ownership is four buckets added together. Miss one and the comparison is fiction.
- Equipment and install: condenser, coil, furnace or air handler, thermostat, permit, labor, and any duct or electrical work.
- Energy: electricity for cooling (and heat-pump heating) plus gas if you keep a furnace. This is usually the largest bucket.
- Maintenance: two tune-ups a year is the honest schedule in SoCal — spring before the heat, fall before you need heat.
- Repairs: capacitors, contactors, motors, boards, and refrigerant work. Cheap installs create expensive years 6 through 12.
A worked example: 3-ton system, 15 years, Glendora
Assume a typical 1,800–2,200 sq ft San Gabriel Valley house that needs about 3 tons of cooling. Two quotes you will actually see:
| Cost over 15 years | Bargain install | Proper install |
|---|---|---|
| Equipment + labor | $9,500 | $14,500 |
| Energy (cooling + fan) | $16,800 | $13,200 |
| Maintenance (2x / year) | $3,000 | $4,500 |
| Repairs (realistic) | $4,200 | $1,800 |
| 15-year total | $33,500 | $34,000 |
The cheap system is not cheaper. It is front-loaded. You save $5,000 on day one and give it back in power bills and service calls. Sometimes you give back more than that — the table above is the polite version.
Where those energy numbers come from
Southern California Edison rates for a typical household often land around $0.30–$0.40 per kWh once you are out of the cheapest baseline tier. A 3-ton system that runs 800–1,000 cooling hours a year is not a rounding error on the bill.
A minimum-efficiency SEER2 14.3 unit uses more electricity than a SEER2 16 or 18 system doing the same job. The gap is not huge in a mild year. It is very real in a 110°F stretch when the compressor never gets a day off.
Rough cooling energy for this house:
- SEER2 14.3: about $1,050–$1,250 per year at current SCE rates.
- SEER2 16: about $900–$1,050 per year.
- SEER2 18 variable-speed: about $750–$950 per year, plus better humidity control so you may run it less aggressively.
Over 15 years, moving from a bargain 14.3 to a well-installed 16 is often $2,000–$4,000 in electricity. That can wipe out the equipment premium. It does not automatically justify the most expensive variable-speed unit on the truck — that depends on hours, solar, and how much you care about comfort.
Maintenance is not optional math
A $150–$200 tune-up twice a year looks skippable until you price a compressor. Dirty coils raise head pressure. Restricted filters raise static pressure. Both cook the compressor and the blower motor.
Manufacturer warranties on parts usually require documented annual service. Skip the visits and you may own a $2,400 compressor that the factory will not cover. That is how a $9,500 install becomes a $12,000 system in year eight.
Repairs: the hidden tax on a sloppy install
The jobs that come back are rarely 'bad brands.' They are wrong charge, wrong airflow, wrong size, or ducts that leak 30% of the air you just paid to condition.
A system that is overcharged, undersized on return air, or sitting on a crushed line set will nickel-and-dime you: frozen coils, tripped breakers, short-cycling, and boards that die from voltage bounce. Those calls add up faster than a higher-quality install ever does.
When a cheaper system really does win
Lifecycle math is not a sales trick to upsell. Sometimes the cheaper system is the right one.
- You are selling the house in two or three years and just need it to work.
- The ducts are a disaster and you are not ready to fix them — throwing a $18,000 variable-speed unit at leaky ducts wastes money.
- You already have solar that covers most of the cooling load, so the SEER2 premium pays back slowly.
- The existing equipment is mid-life and a targeted repair (coil, capacitor, control board) buys honest years.
Joe's rule
If I would not put it in my own house in Glendora, I will not put it in yours. Sometimes that means repairing the coil instead of replacing the condensing unit. Sometimes it means spending more on ducts than on the box in the backyard. The 15-year number decides — not the brochure.
How to compare quotes without getting played
- Make every quote list model numbers, SEER2, AHRI match, and whether Manual J was actually run.
- Ask what static pressure they expect and whether they will measure it at startup.
- Get the duct assessment in writing. 'Ducts look fine' is not an assessment.
- Price maintenance for 15 years, not just the install.
- Ignore the brand war. Installation quality beats the logo on the cabinet.
If you want the real number for your house — not a national average — call and we will run the load, look at the ducts, and put energy and maintenance next to the equipment price. That is the only quote worth signing.