Mini-Split Installation Quote: 15 Questions to Ask Before You Sign

A mini-split installation quote should include more than an equipment model and a total price.

The long-term performance of a mini-split depends heavily on sizing, placement, refrigerant piping, drainage, electrical work and commissioning.

Before signing a contract, ask these 15 questions.

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1. How Was the System Sized?

Ask whether the contractor performed a heating and cooling load calculation.

A quote based only on floor area may overlook:

• Windows
• Insulation
• Ceiling height
• Air leakage
• Climate
• Occupancy
• Sun exposure
• Internal heat sources

DOE recommends professional sizing and installation to support mini-split performance.

2. What Is the Exact Matched System?

Request the model numbers for:

• Outdoor unit
• Every indoor unit
• Controller
• Optional accessories

Efficiency and capacity ratings apply to tested combinations, not random indoor and outdoor pairings. ENERGY STAR notes that indoor-only or outdoor-only equipment must be rated as part of a complete system combination.

3. What Capacity Will It Provide in My Climate?

For a heat pump, ask for heating capacity at the local winter design temperature.

The headline rating may not reflect performance in very cold weather.

4. Where Will Each Indoor Unit Be Installed?

The quote should identify approximate locations.

Discuss:

• Airflow
• Drafts
• Furniture
• Service access
• Sensor position
• Noise
• Appearance

Do not let the installer choose the final position only after drilling begins.

5. Where Will the Outdoor Unit Go?

Ask about:

• Required clearances
• Snow accumulation
• Roof runoff
• Noise near bedrooms
• Vibration
• Flooding
• Service access
• Landscaping

6. How Will Condensate Drain?

The contractor should explain whether the system uses:

• Gravity drainage
• A condensate pump
• An interior drain
• An exterior termination

Ask where the water will go and how the drain can be cleaned later.

7. Is Electrical Work Included?

Clarify whether the quote includes:

• New circuit
• Breaker
• Disconnect
• Wiring
• Surge protection
• Permit
• Electrical inspection
• Panel upgrades

Do not assume “complete installation” automatically includes every electrical requirement.

8. Are Permits Included?

Permit requirements vary by location.

Ask who obtains them and whether the price includes associated fees.

9. How Will the Refrigerant Lines Be Protected?

Exposed insulation can deteriorate in sunlight and weather.

Ask whether the quote includes a line-set cover, exterior sealing and protection against physical damage.

10. Is the Wall Opening Sealed?

The penetration should be sealed against:

• Water
• Pests
• Air leakage
• Outdoor humidity

Ask what materials and flashing method will be used.

11. How Will the System Be Commissioned?

Proper startup may include:

• Pressure testing
• Evacuation
• Leak checking
• Electrical checks
• Drain testing
• Temperature measurements
• Control testing
• Recording operating data

A quick power-on test is not the same as full commissioning.

12. What Labour Warranty Is Included?

Equipment and labour warranties are not the same.

Ask:

• How many years are covered?
• Who pays travel charges?
• Is diagnostic time included?
• Are refrigerant leaks covered?
• Does the warranty transfer to a new owner?

13. Who Registers the Equipment?

Some manufacturers require registration within a set period to receive extended coverage.

Confirm who completes it and ask for proof.

14. What Maintenance Is Required?

Request a written explanation of:

• Filter cleaning
• Professional service
• Drain maintenance
• Outdoor-unit clearance
• Warranty-related obligations

15. What Is Not Included?

Ask the contractor to list exclusions.

Common extras can include:

• Drywall repair
• Painting
• Electrical-panel upgrades
• Condensate pumps
• Long line sets
• Equipment stands
• Crane access
• Asbestos-related work
• Wi-Fi accessories

Compare Value, Not Just Price

The lowest quote may exclude important work. The highest quote is not automatically the best either.

Compare:

• Equipment quality
• Design approach
• Warranty
• Installation details
• Contractor experience
• Service support
• Included accessories

Ask About Smart Control Before Installation

Built-in Wi-Fi, manufacturer adapters and external infrared controllers offer different features.

Klima by Boldr can add app control, schedules and automations to many compatible remote-controlled mini-splits without thermostat wiring.

Confirm compatibility before installation so the indoor unit and controller can be positioned correctly.

Frequently Asked Questions

Should a mini-split quote include model numbers?

Yes. You should know exactly which indoor and outdoor equipment is being proposed.

Is a load calculation really necessary?

It is the best way to estimate the actual heating and cooling requirement instead of guessing from floor area.

Should I pay the full amount upfront?

Payment structures vary, but contracts should clearly state deposits, milestones and final payment terms.

How many quotes should I get?

Obtaining several detailed quotes can help you compare design assumptions and exclusions—not merely prices.