Before submitting a request for proposal (RFP) for an HVAC replacement project, facility managers and property managers can save time, reduce change orders, and receive more comparable bids by gathering the right information upfront. When contractors understand your building, equipment, and constraints, they can propose the right scope, plan realistic lead times, and flag potential cost drivers early. The checklist below outlines the details that most directly affect equipment selection, labor planning, crane needs, and electrical or controls coordination.

Contractors need a general understanding of the building before they can recommend equipment or provide accurate pricing. Coordinate with tenants, engineering staff, or maintenance teams to collect building details that influence load assumptions and zoning decisions.

Gather:

• Building square footage
• Number of floors
• Building type (office, retail, warehouse, medical, restaurant, etc.)
• Occupancy hours
• Areas with higher heat loads (kitchens, conference rooms, server rooms)
• Known comfort issues (hot spots or cold spots)

This information helps contractors provide recommendations on equipment sizing, zoning requirements, and whether the existing system design should be replicated or modified.

One of the most important steps before requesting bids is gathering information about the existing equipment. The more accurately you can identify what is currently installed, the easier it is for contractors to determine whether the replacement is truly like-for-like or if additional modifications should be assumed.

Gather:

• Equipment model numbers
• Serial numbers
• Equipment sizes or tonnage
• Approximate equipment age
• Maintenance history (if available)
• Known issues or recurring repair problems
• Photos of equipment nameplates

Providing accurate equipment information allows contractors to determine whether a like-for-like replacement is the best approach or if additional modifications may be required.

For buildings with rooftop units, roof conditions and access play a major role in replacement planning and cost. Even when the equipment selection is straightforward, roof access and crane planning can drive labor, scheduling, and safety requirements.

Gather:

• Roof type (TPO, metal, modified bitumen, etc.)
• Roof age
• Planned roof replacement projects
• Roof access type (ladder, roof hatch, elevator, stairs)
• Clearance around existing units
• Whether a crane will likely be required

Crane scheduling, roof access, and roof condition can significantly affect labor costs and project timelines, so this information is important early in the bidding process.

Electrical infrastructure is one of the most common factors that affects HVAC replacement cost. If a contractor cannot confirm service size, available capacity, and disconnect locations, they may either exclude upgrades from the bid or add contingency to protect against unknowns.

Gather:

• Electrical service size and voltage
• Available panel capacity
• Location of electrical disconnects
• Known electrical capacity issues
• Gas line sizes and meter capacity (for gas-fired equipment)

In some cases, electrical or gas upgrades may be required to support new equipment, which can add to the project cost and timeline.

Many commercial buildings use programmable thermostats, zoning systems, or building automation systems to control HVAC equipment. Controls compatibility can affect equipment selection and installation scope, especially in buildings with multiple zones or centralized control.

Gather:

• Type of thermostats or control systems in the building
• Whether the building uses a building automation system (BAS or BMS)
• How many zones each unit serves
• Control issues currently occurring
• Whether controls will be upgraded during replacement

Before requesting bids, consider project timing and scheduling constraints that impact labor planning, equipment delivery, and crane coordination. If after-hours work or phased replacement is expected, contractors should price and plan accordingly from the start.

Gather:

• Desired project timeline
• Busy seasons for the business
• After-hours or weekend installation requirements
• Tenant coordination requirements
• Whether units will be replaced all at once or in phases

Providing this information helps contractors plan labor, equipment delivery, and crane scheduling.

Accurate RFPs help, but there are factors outside a facility manager’s control that can influence pricing and project timelines—especially differences in how commercial HVAC contractors formulate bids. You could receive significantly different bids even if your RFP is entirely on point because contractors interpret scope differently or include different levels of work, overhead, and risk assumptions.

For example, one contractor may include new curb adapters, while another assumes existing curbs will be reused. One may include electrical upgrades, while another assumes existing power is adequate.

Request a Commercial HVAC Replacement Bid for Your DFW Project
Tom’s Commercial works with facility managers, property managers, and building owners throughout Arlington, Fort Worth, and surrounding areas to plan and complete commercial HVAC replacement projects, including rooftop units, split systems, and other commercial HVAC equipment.

If you are planning an upcoming HVAC replacement project and need help evaluating equipment, budgeting for replacement, or requesting bids, Tom’s Commercial can help you plan the project and provide a detailed proposal. Call Tom’s Commercial at 817-857-7400 to request a commercial HVAC replacement bid or project consultation.