About MaksBuilder

Foothill Ranch · South Orange County

HVAC Repairs and Installations, Based in Foothill Ranch

MaksBuilder is a California C-20 HVAC contractor based in Foothill Ranch. We repair, maintain and install air conditioners, furnaces, heat pumps and ductless systems for homeowners across South Orange County.

For a new system, Maksym visits the property, reviews the existing equipment and installation conditions, and provides a written proposal with equipment options. MaksBuilder handles permits for system replacements.

On a repair visit, we check the components related to the complaint. If the cause is clear, we can discuss the repair; if it isn't, the next step is further testing—not a premature replacement quote.

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Local MaksBuilder HVAC contractor in South Orange County
MaksBuilder HVAC service in South Orange County.
Who Handles Your Estimate

Meet Maksym

Maksym handles free in-home estimates for new HVAC systems. He reviews the current equipment, ductwork, access and electrical requirements before discussing options that suit the property.

The written proposal describes the equipment choices, planned installation work and any additional changes the project may require. Each new system is sized using a Manual J load calculation.

What happens before and after installation
  1. On-site assessment by Maksym
  2. Equipment options and written work scope
  3. Load calculation for the new system
  4. Permit handling for replacements and startup testing
Diagnostics & Equipment Decisions

What We Check Before Recommending HVAC Work

What you noticeWhat we may checkWhat happens next
AC runs but does not coolFilter and airflow, electrical operation, coil condition and the refrigerant circuitIf the initial checks don't explain the problem, more refrigerant-circuit testing may be needed before recommending a major component replacement.
Upstairs stays hotterSupply and return airflow, duct restrictions, insulation and system capacityIf the problem is in the ducts or return airflow, installing a larger AC unit alone may leave the temperature difference unchanged.
Furnace shuts down earlyIgnition and flame sensing, airflow, high-temperature limits and thermostat operationThe shutdown sequence guides the repair. A safety control should not be bypassed to keep the furnace running.
You're replacing an aging systemManual J load calculation, ductwork, electrical requirements and equipment clearancesThe findings help determine equipment size and any ductwork or electrical changes to include in the written estimate.

Depending on the findings, we'll discuss a repair, explain the additional testing needed or prepare a replacement estimate. For specific services, see AC repair, furnace repair and AC installation and replacement.

Independent Customer Feedback · November 2026

Diamond Certified

MaksBuilder received Diamond Certified recognition in November 2026. The program uses independent customer surveys and recognizes companies for quality and helpful expertise.

Official company report
View the full Diamond Certified report

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Customer Feedback

What Our Customers Say

★★★★★

“Came out really quickly. I really appreciated their honesty! Would hire them again & recommend to friends!”

C J. · Google review
★★★★★

“Prompt response and prompt appointment. Process of communication was easy and clear.”

Noha A. · Google review
Where We Work

South Orange County Service Areas

Based in Foothill Ranch, MaksBuilder serves these 12 communities. Provide your property address when requesting an appointment.

Need HVAC Service in Orange County?

Describe the issue, equipment and service address. For a new installation, request a free in-home estimate with Maksym.

Contact MaksBuilder