What This Clause Means
Your lease says the building provides air conditioning. What it doesn't say — but your after-hours HVAC clause does — is that you'll pay $65–$125/hour extra any time you need it outside of 8am–6pm weekdays. For businesses that regularly work late or on weekends, after-hours HVAC charges can add $15,000–$40,000/year to occupancy costs.
Standard Lease HVAC Hours Are Often Narrower Than Your Business Hours
Most commercial office leases provide HVAC service — heat and air conditioning — during 'building standard hours,' typically 8am–6pm on weekdays and 8am–1pm on Saturdays. Any HVAC use outside those hours is 'after-hours' service, provided only upon request and at an additional hourly charge. The charge covers the cost of running the building's HVAC systems specifically for your suite outside normal operating periods. For businesses with standard 9-to-5 hours, this isn't an issue. For businesses with frequent evening events, client meetings outside standard hours, or weekend operations — law firms, consulting companies, events businesses — after-hours HVAC costs are a material line item that belongs in your occupancy cost model.
After-Hours HVAC Rates Are Set by the Landlord and Often Inflated
After-hours HVAC rates in commercial leases typically range from $45/hour in lower-cost markets to $125/hour in major metro buildings. The rate is supposed to reflect the actual cost of running the HVAC system for your specific zone during non-standard hours. In practice, after-hours HVAC is frequently a profit center — landlords charge rates significantly above actual cost because tenants have no alternative for climate control in a sealed commercial building. Negotiate the after-hours HVAC rate into the lease itself (not 'at landlord's then-current rates') and push for the rate to reflect actual cost plus a 15% administrative fee, with annual adjustments limited to 5%.
Estimate Your After-Hours HVAC Costs Before Signing
Before signing any office lease, count how often you realistically need after-hours HVAC. A law firm that runs deals — regularly working until 10pm and on weekends — might need 200 hours/month of after-hours HVAC. At $85/hour, that's $17,000/month — $204,000/year in after-hours charges that dwarf the base rent on smaller suites. A financial services firm that hosts quarterly client events on evenings might need 20 hours/month — $1,700/month, significant but manageable. Model this accurately before negotiating your lease, because it changes the optimal lease terms dramatically.
Zone Minimums Add Cost You Don't Control
Most HVAC systems serve multiple zones — often an entire floor or large building section. When you request after-hours HVAC, you're often paying to run the entire zone, not just your specific suite. If you occupy 2,000 sq ft on a floor with 20,000 sq ft of leasable space, you're still paying to run the HVAC for the entire floor when you stay late. This 'zone minimum' problem means after-hours HVAC is most economical when you occupy a full floor or a large percentage of a zone. Negotiate for individual zone-level HVAC control — HVAC systems that can be activated for your specific suite rather than an entire floor — particularly if the building is being renovated or if your suite is otherwise configured to allow it.
Negotiating After-Hours HVAC in Your Lease
Five negotiating strategies: First, include a fixed number of after-hours HVAC hours in your base rent — 50 or 100 hours/month included before additional charges begin. Second, negotiate the rate per hour into the lease rather than deferring to 'landlord's then-current rate.' Third, push for individual zone control so you're not paying for the entire floor. Fourth, negotiate reduced rates for weekend HVAC if weekends are important to your business. Fifth, ask about the building's HVAC system type — some modern buildings with variable refrigerant flow (VRF) systems can provide after-hours HVAC at much lower cost per zone than traditional central HVAC systems.
After-Hours HVAC Charges on NNN Leases Work Differently
In NNN leases for standalone buildings or ground-floor retail, the after-hours HVAC issue is different — you're responsible for the HVAC system maintenance and operation, not the landlord. Your cost of operating the system late isn't an 'after-hours charge' to the landlord; it's your own utility cost. The concern in NNN leases is whether the HVAC system is capable of efficiently serving extended hours, and whether the system's age means you'll face significant capital replacement costs if you're running it harder than a standard retail or office operation. Get the HVAC condition report regardless — and for systems you're responsible for maintaining, factor 24/7 operation into the system's wear-and-tear analysis.
What to Watch Out For
- Negotiate a fixed after-hours rate stated in the lease, not 'Landlord's then-current rate'
- Cap annual increases to the after-hours rate at 3%
- Include evening and weekend hours in standard building hours if your business requires it
- Negotiate a block of after-hours hours per month at no additional charge
- Confirm HVAC coverage extends to your specific zone, not just building-wide
How to Negotiate This Clause
Include 100 hours of after-hours HVAC per month in base rent; negotiate the hourly rate explicitly into the lease (not 'landlord's current rate'); push for individual zone control; limit annual rate increases to 5%; and for high after-hours usage, consider negotiating a flat monthly fee for unlimited after-hours HVAC access.
- Negotiate a fixed after-hours rate stated in the lease, not 'Landlord's then-current rate'
- Cap annual increases to the after-hours rate at 3%
- Include evening and weekend hours in standard building hours if your business requires it
- Negotiate a block of after-hours hours per month at no additional charge
- Confirm HVAC coverage extends to your specific zone, not just building-wide
Example Language: Bad vs. Better
Landlord-Friendly (Risky)
"HVAC service is provided during Standard Building Hours of 8:00am to 6:00pm Monday through Friday and 9:00am to 1:00pm Saturday. After-hours HVAC shall be provided upon Tenant's request at Tenant's cost at Landlord's then-current rate per hour per zone."
Tenant-Friendly (Better)
"After-hours HVAC shall be available at a fixed rate not to exceed $75 per hour per zone, which rate may increase no more than 3% annually. Tenant shall have access to HVAC 24/7 with no minimum hour requirements. Current after-hours rate: $[X] per hour."
Frequently Asked Questions
- What are after-hours HVAC charges?
- After-hours HVAC charges are fees for using heating or cooling outside the building's standard operating hours. Buildings typically run HVAC systems during core business hours — any request outside those hours incurs additional per-hour costs.
- How much do after-hours HVAC charges typically run?
- Rates vary significantly by market and building. Expect $50–$200 per hour per zone. A multi-zone office running after-hours HVAC several evenings per week could spend $1,000–$5,000 per month beyond base CAM costs.
- How are after-hours HVAC costs controlled in lease negotiations?
- Negotiate a fixed rate written into the lease with a capped annual escalation. Better yet, negotiate extended building hours or an after-hours HVAC credit included in CAM. Avoid leases where the rate is determined entirely at landlord's discretion.
- Does my CAM include after-hours HVAC?
- Typically no. CAM covers HVAC during standard building hours. After-hours HVAC is an additional direct charge billed to tenants who request it. Some leases include a small monthly HVAC credit applicable to after-hours use.
- What if I need 24/7 HVAC access for my business?
- If your business (medical, data center, 24-hour operations) requires continuous HVAC, negotiate for this upfront. You may need a separate HVAC unit, 24/7 included service at a negotiated rate, or a separate HVAC agreement outside standard CAM.