A service visit
Ask about the diagnostic charge, what it covers and whether any of it applies to an approved repair. Diagnosis and repair are separate decisions.
Heating, cooling & home comfort · Orange County
Get comfortable.
Know what comes next.
Get help with a system that is not keeping up, plan routine care, or explore a replacement. Start with what you have noticed. You do not need to know the fix.
Need service today? Call (714) 576-4733.
Explore comfort services →
COST ESTIMATOR
Understand the cost before the visit.
Choose the work and enter its size. Get a starting range without an email address or an existing quote.
Prices checked September 2026. Anything not priced online is confirmed at your visit.
START WITH YOUR SITUATION
What does your home need today?
A repair visit, routine care and a replacement estimate start with different questions. Choose yours; no equipment knowledge or contact details needed.
Answer what you know. No name, email or photos needed.
UNDERSTAND THE PRICE
What belongs in the budget?
Know what a price covers before deciding whether it fits.
A replacement
Compare equipment, sizing assessment, ducts, electrical work, removal, permits and commissioning. An equipment price alone is not an installed system.
Ongoing care
Compare the visit schedule, included checks, exclusions and renewal terms. Ask how repairs and priority service are handled separately.
Ideas with a purpose.
Explore the brief, the choices and the scope behind each project.
Fullerton
A considered whole-home replacement
A compact outdoor unit anchors a replacement plan that starts inside the house.
Explore the project →
Orange
An office with its own comfort zone
A ductless concept gives a frequently used room a more focused solution.
Explore the project →
Tustin
A living room that feels connected
An airflow-focused brief looks beyond the thermostat setting.
Explore the project →Choose the work that fits.
A good starting point is the part of your home you want to improve.
Heat pumps & system replacement
Plan heating and cooling around the home, not simply the size of the old unit.
Explore this service →Ductless room comfort
Give an office, addition or hard-to-condition room its own comfort plan.
Explore this service →Repairs, maintenance & airflow
Find out why the system is struggling before deciding what to replace.
Explore this service →Before you decide.
A comfortable home begins with a clear description of what is not working. We connect that everyday experience to the assessment, equipment and installation details that belong in the solution.
01
Listen to the comfort problem first.
02
Put the complete installation beside the equipment price.
03
Explain the controls, care and handoff.
Take the next step with more detail.
Have repair and replacement quotes? Compare the longer-term costs.
Repair now, or plan a replacement?
Compare your own quotes and annual running-cost estimates over the same period. Keep the comfort questions beside the numbers.
No contact details needed. Your work stays in this browser tab, so download a copy before closing it.
Budget basis & scope to confirm
The planner adds your quote to the yearly running and maintenance costs you enter, over 3, 5 or 10 years, so you compare both options the same way.
- Future breakdowns, replacement and changes in energy rates
- Financing, inflation, discounting and resale value
- Duct, electrical or other work omitted from your quotes
Prices checked September 2026.
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Compare one of our projects with your space and keep the look you like next to your notes.
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What homeowners say
“The AC died on the hottest day of the year. I called at 8, Marco was here by 11 and had it running by noon. He showed me the failed part and the price before he touched anything.”
“Two other companies quoted a bigger unit without measuring anything. Stillair did the calculation and put in a smaller heat pump that keeps every room even. Our summer bill dropped.”
“I called about no heat expecting to hear we needed a new furnace. They replaced an igniter, showed us the old one, and told us the furnace has years left.”
Good questions. Clearer decisions.
What should I understand before comparing prices?
A service visit: Ask about the diagnostic charge, what it covers and whether any of it applies to an approved repair. Diagnosis and repair are separate decisions. A replacement: Compare equipment, sizing assessment, ducts, electrical work, removal, permits and commissioning. An equipment price alone is not an installed system. Ongoing care: Compare the visit schedule, included checks, exclusions and renewal terms. Ask how repairs and priority service are handled separately.
Should I repair or replace my system?
We find the fault first. A system under ten years old with one problem usually gets repaired. An old system failing repeatedly gets a repair price and a replacement price so you can compare.
Can you size equipment from square footage alone?
A home-specific load assessment considers more than floor area. Ask how the proposed size was determined and whether the ducts and airflow support it.
Will a heat pump lower my bills?
Usually, in our mild climate, but it depends on your rates and how you use it. We show you the estimate with its assumptions so you can judge it.
Take the first step today.
Price the work, keep a planning summary, or send us a note. We reply within one business day.
Find the right service Send us a messageServices
Explore the fit, options and scope for the work you are considering.
Heat pumps & system replacement
Plan heating and cooling around the home, not simply the size of the old unit.
Explore this service →Ductless room comfort
Give an office, addition or hard-to-condition room its own comfort plan.
Explore this service →Repairs, maintenance & airflow
Find out why the system is struggling before deciding what to replace.
Explore this service →Heat pumps & system replacement
Plan heating and cooling around the home, not simply the size of the old unit.
When it is worth considering
A replacement project where equipment condition, comfort, operating costs and the home’s requirements need to be considered together.
Options to compare
- Ducted heat pumps with existing ducts assessed for suitability.
- Other replacement options based on the home, utilities and priorities.
- Controls and zoning compatible with the specified equipment.
Put these in the scope
- A home-specific sizing assessment
- Ductwork, electrical scope and condensate management
- Commissioning, controls and owner handoff
Living with the result
Keep filters and service access in the maintenance plan. Ask for the manufacturer’s care instructions and a clear explanation of parts and labor coverage.
Ductless room comfort
Give an office, addition or hard-to-condition room its own comfort plan.
When it is worth considering
A room or zone where extending or changing the central system may not be the best fit.
Options to compare
- Single-zone systems for a defined space.
- Multiple zones with equipment and controls selected together.
- Indoor unit styles and locations suited to the room.
Put these in the scope
- Indoor and outdoor unit locations
- Line routing, drainage and electrical work
- Access for cleaning and future service
Living with the result
A ductless system still needs cleaning and maintenance. Discuss filter access, noise and the appearance of line covers before approving locations.
Repairs, maintenance & airflow
Find out why the system is struggling before deciding what to replace.
When it is worth considering
A room that never feels right, a strange noise, or a system that keeps needing another repair.
Options to compare
- A service call to find the fault, with the fee off any repair we do that day.
- Repairs with the cause and the price in writing first.
- Airflow and duct checks for rooms that never feel right.
Put these in the scope
- Reported symptoms and service history
- Diagnostic findings and repair options
- Maintenance recommendations for the actual equipment
Living with the result
Keep a record of service, filter changes and recurring symptoms. If the same room remains uncomfortable, bring that history to the next assessment.
Project gallery
Different spaces. Different priorities. See how the brief shapes each project.
Fullerton
A considered whole-home replacement
A compact outdoor unit anchors a replacement plan that starts inside the house.
Explore the project →Orange
An office with its own comfort zone
A ductless concept gives a frequently used room a more focused solution.
Explore the project →Tustin
A living room that feels connected
An airflow-focused brief looks beyond the thermostat setting.
Explore the project →A considered whole-home replacement
A compact outdoor unit anchors a replacement plan that starts inside the house.
The brief
The brief combines summer cooling, winter heating and a clearer ownership plan. The equipment location preserves service access without taking over the garden.
The decision that matters
We ran a load calculation on the house, sealed the ducts and checked the panel before choosing the unit.
An office with its own comfort zone
A ductless concept gives a frequently used room a more focused solution.
The brief
The office is in use while the rest of the house is quiet, so that room got its own zone with its own temperature.
The decision that matters
One indoor head, a small outdoor unit and a hidden drain line, without touching the rest of the house.
A living room that feels connected
An airflow-focused brief looks beyond the thermostat setting.
The brief
The homeowner’s concern is a living room that feels different from the rest of the house. The project begins with the pattern of use and the existing system’s performance.
The decision that matters
We measured airflow room by room, repaired two ducts and added a return. No new equipment needed.
Pricing & scope
Compare the same years and the same assumptions.
Diagnostic visit
$75 to $200 / visitThe visit to find the fault. You approve any repair before we start it.
HomeGuide cost guide ↗Maintenance visit
$70 to $200 / visitA seasonal tune-up. Repairs and refrigerant are priced separately.
HomeGuide cost guide ↗Heat-pump replacement
$3,800 to $8,200 / systemAn installed heat pump. Sizing, ducts and electrical work are confirmed at your visit.
HomeGuide cost guide ↗Central AC replacement
$2,500 to $7,500 / systemAn installed central air conditioner.
HomeGuide cost guide ↗Furnace and AC replacement
$5,000 to $11,000 / systemFurnace and air conditioner replaced together. New ductwork is priced separately.
HomeGuide cost guide ↗Typical installed price ranges. Your written quote confirms the full scope.
Calculate a starting budget →A service visit
Ask about the diagnostic charge, what it covers and whether any of it applies to an approved repair. Diagnosis and repair are separate decisions.
A replacement
Compare equipment, sizing assessment, ducts, electrical work, removal, permits and commissioning. An equipment price alone is not an installed system.
Ongoing care
Compare the visit schedule, included checks, exclusions and renewal terms. Ask how repairs and priority service are handled separately.
Pricing details
The planner adds your quote to the yearly running and maintenance costs you enter, over 3, 5 or 10 years, so you compare both options the same way.
Costs and details to confirm
- Future breakdowns, replacement and changes in energy rates
- Financing, inflation, discounting and resale value
- Duct, electrical or other work omitted from your quotes
Compare the same work
Ask for quantities, specified products, preparation, exclusions and the process for approving additional work. A lower number is useful only when you understand what changed.
Keep a useful record
Use the cost estimator for a starting range and the planning tools for scope details. Both create a PDF of your scope and questions. No contact details are required.
Supporting resources
Checked September 2026.
What happens next
A clear path from the first conversation to the completed work.
Describe the need
Separate an active fault, routine care and a replacement goal so the right conversation happens first.
Confirm the visit
Agree on availability, diagnostic or assessment charges and what the visit includes.
Review the findings
Compare the proposed work and total scope before authorizing it.
Keep the care plan
Collect commissioning or service records, warranty contacts and maintenance instructions.
Common questions
What should I understand before comparing prices?
A service visit: Ask about the diagnostic charge, what it covers and whether any of it applies to an approved repair. Diagnosis and repair are separate decisions. A replacement: Compare equipment, sizing assessment, ducts, electrical work, removal, permits and commissioning. An equipment price alone is not an installed system. Ongoing care: Compare the visit schedule, included checks, exclusions and renewal terms. Ask how repairs and priority service are handled separately.
Should I repair or replace my system?
We find the fault first. A system under ten years old with one problem usually gets repaired. An old system failing repeatedly gets a repair price and a replacement price so you can compare.
Can you size equipment from square footage alone?
A home-specific load assessment considers more than floor area. Ask how the proposed size was determined and whether the ducts and airflow support it.
Will a heat pump lower my bills?
Usually, in our mild climate, but it depends on your rates and how you use it. We show you the estimate with its assumptions so you can judge it.
What should a replacement proposal include?
Equipment model numbers, sizing basis, duct and electrical scope, controls, removal, approvals, commissioning and warranty responsibilities. Clarify exclusions before comparing totals.
Does the calculator include rebates or future repairs?
Only the amounts you enter. Use quotes after any confirmed adjustments, and explain those adjustments when comparing. Inflation, financing, future breakdowns and resale value are excluded.
How fast can you come out?
Same day, seven days a week, when a system has stopped heating or cooling. Call (714) 576-4733. If you smell gas or a carbon monoxide alarm goes off, leave the house and call the utility or 911 first.
Our approach
A comfortable home begins with a clear description of what is not working. We connect that everyday experience to the assessment, equipment and installation details that belong in the solution.
01
Listen to the comfort problem first.
02
Put the complete installation beside the equipment price.
03
Explain the controls, care and handoff.
Clear scope. Considered choices.
We believe the proposal should be understandable before the first product is ordered. Good questions about preparation, access and care make the visible result easier to plan.
Orange County
We serve homeowners in Fullerton, Orange, Irvine, Costa Mesa, Tustin, Anaheim and nearby communities.
Send us a message →Reviews
“The AC died on the hottest day of the year. I called at 8, Marco was here by 11 and had it running by noon. He showed me the failed part and the price before he touched anything.”
“Two other companies quoted a bigger unit without measuring anything. Stillair did the calculation and put in a smaller heat pump that keeps every room even. Our summer bill dropped.”
“I called about no heat expecting to hear we needed a new furnace. They replaced an igniter, showed us the old one, and told us the furnace has years left.”
Contact
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Your photos and planning details
Estimates and planning answers stay in your browser. A photo you add to the project photo board stays on your device. Reloading or closing the tab clears your work, so download a copy if you want to keep it.
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About this website
This is a sample website by Dept5. Stillair Heating & Cooling is a fictional company. Its people, projects and reviews are examples, and the images are illustrations. Prices shown are ranges, not quotes.