How to Compare Two HVAC Quotes (Without Guessing)

Understanding quote differences through scope comparison — without pricing judgments or contractor recommendations.

Two heat pump quotes can differ by thousands of dollars while appearing to propose similar work. This guide explains how to compare quotes by examining what each contractor actually includes, rather than comparing prices alone.

ClarityHeat helps you understand what's in each quote, not which quote is better or which contractor to choose.

1. Why Direct Price Comparison Is Misleading

Comparing quotes by total price assumes both contractors are proposing identical work. This is rarely the case. Quotes differ in:

• What's explicitly included
• What's assumed to be adequate
• What's listed as "if needed" or "TBD"
• How thoroughly scope is defined

Understanding these differences clarifies what you're actually comparing.

2. Compare Equipment Specifications

System Capacity and Sizing

Check whether both quotes propose the same tonnage. If one contractor recommends 2 tons and another recommends 3 tons, ask why. Different sizing recommendations may reflect different load calculation methods or assumptions about your home.

Efficiency Ratings

Compare SEER2 and HSPF2 ratings. Higher ratings indicate better efficiency but also higher equipment cost. A quote with 16 SEER2 equipment costs less than one with 20 SEER2, but the efficiency difference affects long-term operating costs.

System Type

Single-stage, two-stage, and variable-speed systems operate differently and cost differently. Variable-speed systems provide better comfort and efficiency but cost more upfront. Make sure you're comparing similar technology levels.

Brand and Model

Specific model numbers matter more than brand names. Different models from the same brand have different features, efficiency levels, and prices. Compare actual model specifications rather than brand reputation.

Compare Installation Scope

Electrical Work

One quote may include new circuit installation while another assumes existing electrical is adequate. Ask each contractor:

• Is new circuit installation included?
• What amperage and wire gauge will be used?
• Is disconnect box included?
• Are any panel upgrades needed?

Ductwork Evaluation

Quotes handle ductwork differently. Some include testing and modifications, others assume existing ducts are adequate. Compare:

• Will ductwork be tested or just visually inspected?
• Are duct modifications included if needed?
• Is duct sealing or insulation included?
• How will airflow adequacy be verified?

Line Set Handling

Check whether each quote plans to reuse existing refrigerant lines or install new ones. Reuse saves money but may not be possible if existing lines are damaged or undersized. Ask:

• Will line set be reused or replaced?
• What determines whether replacement is needed?
• Is replacement cost included or additional?

Permits and Inspections

Some quotes include permit costs, others list them separately. Verify:

• Are permits included in the quoted price?
• Who handles permit applications?
• Are inspection fees included?

Compare Warranty Coverage

Parts Warranty

Standard parts warranties range from 5-10 years. Some contractors offer extended coverage. Check:

• How many years of parts coverage?
• Is compressor covered separately?
• Are all components covered or just major parts?

Labor Warranty

Labor coverage varies significantly. Some contractors offer 1 year, others offer 5-10 years. Longer labor coverage costs more upfront but protects against future service costs.

Warranty Registration

Ask whether contractor handles warranty registration or if you need to register equipment yourself. Some extended warranties require professional registration.

Compare Sizing Methodology

How each contractor determined system size matters for long-term performance.

Manual J Load Calculation

Quotes that mention Manual J or similar load calculations indicate proper sizing methodology. Ask contractors who don't mention it:

• How was system size determined?
• What factors were considered?
• Can you provide load calculation documentation?

Square Footage Estimation

Some contractors size systems based on square footage rules of thumb. This method is faster but less accurate than load calculations. If contractors recommend different sizes, sizing methodology may explain the difference.

Compare What Happens If Issues Arise

Installation day sometimes reveals unexpected issues. Compare how quotes address this:

Contingency Language

Look for phrases like "if needed," "as required," or "TBD." These indicate potential additional costs. Ask:

• What conditions would result in extra charges?
• How are additional costs determined?
• Will I be notified before additional work is performed?

Change Order Process

Understand how each contractor handles scope changes. Will you receive written change orders with pricing before work proceeds?

3. Questions to Clarify Quote Differences (Neutral & Non-Directional)

These questions help understand what each quote includes:

• "Why do you recommend this system size?"
• "What electrical work is included in your quote?"
• "How will you verify ductwork is adequate?"
• "Will the line set be reused or replaced?"
• "What warranty coverage is included?"
• "Are permits and inspections included?"
• "What could cause the final price to differ from this quote?"
• "How do you handle unexpected issues during installation?"

These questions clarify scope differences without judging which approach is better.

4. Important Notes on Quote Comparison

• Price differences usually reflect scope differences, not value differences.
• This guide explains how to compare, not which quote to choose.
• Different contractors define "standard installation" differently.
• ClarityHeat does not recommend contractors or evaluate quote quality.

Understanding what each quote includes helps you make informed decisions based on your priorities and budget.