HVAC May 15, 2025 1 min readUpdated Sep 30, 2026
Replacement of start capacitor and thermostat – Day&Night AC, San Jose
Client's Complaint: The air conditioner stopped turning on. The outdoor unit wasn’t starting, and the system was unresponsive.

Licensed & insured
C-10 · C-20 · C-36
4.9 on Google
300+ verified reviews
1-hour response
Mon – Sat
Permitted & guaranteed
Clean, code-compliant work
Replacement of start capacitor and thermostat – Day&Night AC, San Jose
Client's Complaint: The air conditioner stopped turning on. The outdoor unit wasn’t starting, and the system was unresponsive.
Our technician arrived on-site and performed diagnostics.
- ✅ It was determined that the start capacitor had failed. The likely cause was frequent short cycling, which puts additional strain on system components and accelerates wear.
- ✅ The thermostat was working properly, but the client requested to replace it with a new one she had on hand.
Equipment: Day&Night, model NXH636GKA01.
- ✅ Our technician replaced the faulty capacitor and installed the new thermostat provided by the client.
- ✅ Diagnosis and repair were completed the same day.
- ✅ Total cost of the repair was under $400.
- ✅ We provide a 6-month warranty on the completed work and the replaced part.
The system was successfully restored and is now functioning properly.
Talk to an engineer
Planning a project like this?
We'll scope the work, model the rebates, and put a real number on it.