How to Reduce Energy Costs in Apartment Buildings: A Property Manager's Guide

Energy Costs Are Eating Into Your NOI — Here Is How to Fight Back

For multifamily property managers in Texas, energy costs are one of the largest controllable operating expenses. Between common area lighting, HVAC for vacant units, shared mechanical systems, and — for properties with owner-paid utilities — tenant unit energy use, the monthly energy bill can be staggering.

The good news? There are proven, practical strategies to reduce energy costs significantly. Some require capital investment. Others are free. And the smartest approach is to start with the easiest, highest-impact changes first and work your way down.

Here is a prioritized guide to reducing energy costs in your apartment buildings — with specific, actionable steps you can take this quarter.

1. Smart Thermostats: The Easiest Win (and It Can Be Free)

If you are going to do one thing on this list, make it this one. Smart thermostats are the single most impactful, lowest-effort energy efficiency upgrade available to multifamily property managers today.

Why Smart Thermostats Come First

• 8-15% HVAC energy reduction per unit, according to ENERGY STAR and DOE research
• HVAC accounts for roughly 48% of total energy costs in residential units — so reducing it has an outsized impact
• Vacant unit management capabilities can cut empty-unit energy costs by 40-50%
• Remote monitoring lets you spot HVAC issues before they become expensive repairs
• No behavior change required from tenants — the automation does the work

The Free Option

Here is what most property managers do not realize: you may not need to pay for smart thermostats at all.

Utility energy efficiency programs in Texas — specifically in the Oncor and AEP Texas service territories — fund free ENERGY STAR certified smart thermostat installations for qualifying multifamily properties. The devices, installation, and programming are all covered at zero cost.

The programs operate on a first-come, first-served basis with limited spots each year. Check your eligibility to see if your property qualifies.

What the Savings Look Like

For a 100-unit property with average annual HVAC costs of $1,500 per unit:

• 10% HVAC savings = $15,000/year property-wide
• Add vacant unit savings (7% vacancy) = $3,000-$5,000 additional
• Total: $18,000-$20,000 in annual savings from a single upgrade

When the upgrade costs you nothing, the return is immediate and ongoing. Learn more about the detailed energy savings data.

2. LED Lighting Upgrades

After HVAC, lighting is typically the second-largest energy expense in multifamily properties — especially in common areas that operate 12-24 hours per day.

Where to Focus

• Parking garages and lots: Often the biggest lighting energy draw. Switching from metal halide or high-pressure sodium to LED can reduce lighting costs by 60-75%
• Hallways and stairwells: These lights run around the clock. LED conversions paired with occupancy sensors can cut hallway lighting costs by 70-80%
• Exterior and security lighting: LED replacements last 3-5 times longer, reducing both energy and maintenance costs
• Laundry rooms and amenity spaces: High-use common areas benefit from both the energy savings and improved light quality

The Numbers

A typical 200-unit apartment complex spends $15,000-$25,000 per year on common area lighting. A full LED conversion can reduce that to $5,000-$8,000 — saving $10,000-$17,000 annually.

Some utility energy efficiency programs also cover LED upgrades for common areas. Ask about bundling this with a smart thermostat upgrade.

3. HVAC Maintenance Optimization

Your HVAC systems are the biggest energy consumers on the property. Keeping them running efficiently is not just good maintenance practice — it is a direct line to lower energy bills.

High-Impact Maintenance Tasks

• Air filter replacement: Clogged filters force HVAC systems to work harder, increasing energy consumption by 5-15%. Establish a regular replacement schedule (every 60-90 days for standard filters)
• Coil cleaning: Dirty condenser and evaporator coils reduce system efficiency by 10-25%. Annual cleaning — ideally before summer — keeps systems running at peak performance
• Refrigerant checks: Low refrigerant levels make cooling systems work harder and longer. Annual refrigerant checks catch slow leaks before they become expensive
• Duct sealing: Leaky ductwork in attics and crawl spaces can waste 20-30% of conditioned air. Sealing ducts is one of the highest-ROI maintenance investments you can make
• Thermostat calibration: If existing thermostats are reading temperatures inaccurately, systems may run longer than necessary. Smart thermostats solve this automatically with better sensors

The Proactive Approach

Instead of reactive maintenance (fixing things when they break), implement a preventive maintenance calendar:

• Monthly: Check and replace air filters across all units
• Quarterly: Inspect common area HVAC equipment, check belts and bearings
• Bi-annually: Full system tune-up before summer cooling season and winter heating season
• Annually: Duct inspection and sealing, refrigerant level checks, coil cleaning

Properties with proactive HVAC maintenance programs report 15-20% lower annual maintenance costs and 10-15% lower energy costs compared to reactive-only approaches.

4. Building Envelope Improvements

The building envelope — walls, roof, windows, and insulation — is the barrier between your conditioned indoor air and the Texas heat. When the envelope has gaps, your HVAC systems have to work overtime.

Quick Wins

• Weatherstripping: Replace worn weatherstripping on exterior doors. Cost: $5-$15 per door. Impact: Noticeable reduction in conditioned air loss
• Caulking: Seal gaps around windows, pipes, and electrical penetrations. Cost: Minimal. Impact: Reduces drafts and infiltration
• Window film: Low-E window film reduces solar heat gain by 30-50% without replacing windows. Cost: $8-$15 per square foot installed. Payback: 2-4 years

Bigger Investments

• Attic insulation: If your buildings have inadequate attic insulation (common in older Texas apartments), adding insulation to R-38 levels can reduce heating and cooling costs by 10-20%
• Window replacement: Double-pane Low-E windows significantly reduce heat gain and loss, but the cost ($300-$700 per window) makes this a longer-term capital investment
• Cool roofing: Reflective roofing materials reduce heat absorption by 30-40%, lowering cooling costs. Best addressed when the roof is due for replacement anyway

5. Tenant Education Programs

This one costs nothing but time, and it can meaningfully impact energy consumption — especially in properties where tenants pay their own utilities.

What to Communicate

• Optimal thermostat settings: Recommend 78 degrees for cooling and 68 degrees for heating. Every degree of overcooling adds 3-5% to energy costs
• Window and door habits: Remind tenants to keep windows and doors closed when HVAC is running. An open window can increase cooling costs by 10-20%
• Reporting maintenance issues: Encourage tenants to report HVAC problems (unusual noises, poor cooling, ice buildup) immediately. Small issues caught early prevent expensive failures and energy waste
• Smart thermostat usage: If your property has smart thermostats, educate tenants on using the energy-saving features. Many tenants do not realize their thermostat can automatically save them money

How to Deliver It

• Move-in packet: Include a one-page energy tips guide with every lease signing
• Seasonal reminders: Send a brief email or notice before summer and winter with relevant energy-saving tips
• Smart thermostat quick-start guide: If you have smart thermostats installed, provide a simple guide showing tenants how to use key features

6. Common Area Optimization

Common areas — lobbies, fitness centers, business centers, club rooms, pools — can be significant energy drains if not managed intentionally.

Quick Fixes

• Programmable timers on common area HVAC: No reason to fully climate-control a fitness center at 3 AM
• Occupancy sensors for lighting in low-traffic areas (storage rooms, mechanical rooms, back hallways)
• Water heater settings: Many common area water heaters are set higher than necessary. Reducing from 140 to 120 degrees saves energy and reduces scald risk
• Pool pump scheduling: If your property has a pool, run pumps during off-peak hours and ensure pump motors are appropriately sized
• Vending machine controllers: Smart plugs or controllers can reduce vending machine energy costs by 40-50% by cycling refrigeration during low-use hours

Prioritizing Your Energy Reduction Strategy

Not every property needs every upgrade. Here is how to think about prioritization:

Tier 1: Do These First (Free or Near-Free)

1. Smart thermostat upgrade through utility programs (free)
2. HVAC filter replacement schedule (minimal cost, immediate impact)
3. Tenant education program (free)
4. Common area thermostat scheduling (free)
5. Weatherstripping and caulking (low cost)

Tier 2: Budget This Year

1. LED lighting conversion for common areas
2. HVAC tune-up and coil cleaning for all units
3. Occupancy sensors for common area lighting
4. Window film for south- and west-facing windows

Tier 3: Capital Planning

1. Duct sealing across the property
2. Attic insulation upgrades
3. Window replacement (when windows are end-of-life)
4. Cool roofing (when roof is due for replacement)
5. HVAC system replacement with high-efficiency units (end of life only)

Start With the Easiest, Biggest Win

If you take nothing else from this guide, remember this: smart thermostats deliver the best ratio of impact to effort for multifamily energy cost reduction. They save 8-15% on the largest single energy expense (HVAC), they require no behavior change from tenants, and — through utility programs — they can be installed at zero cost.

Everything else on this list is worth doing too. But start where the math is most compelling.

Check if your property qualifies for free smart thermostats or learn how the installation process works.

Ready to start reducing energy costs? Get your free eligibility check today.