If you own a small multi-family in Mott Haven, Fordham, or Pelham Bay, you've probably opened your July or August Con Ed bill and felt your stomach drop. Summer utility costs in the Bronx have climbed hard in 2026, and most landlords are absorbing thousands in preventable expenses without realizing it.
Unlike rent, utilities don't have a ceiling — they keep climbing until you intervene. Below are the five biggest summer money leaks I see across Bronx portfolios, and exactly what to do about each before October.
1. Hallway and Common-Area Lighting Running 24/7
Walk into almost any 6-unit walkup on Grand Concourse and you'll see incandescent or old CFL bulbs burning all day in the hallway. At Con Ed's 2026 supply + delivery rate of roughly $0.33/kWh, a single 60-watt bulb running 24/7 costs about $173 per year. Multiply that by 8 fixtures in a typical walkup and you're at $1,384 annually — just for hallway light.
The fix:
- Swap every common-area bulb for a 9W LED ($3-4 each at the Home Depot on Bruckner)
- Install motion sensors on stair landings ($15-25 each)
- Expected savings: 80-85%, or roughly $1,100/year on a typical 6-unit
Payback period: under 2 months. This is the single highest-ROI fix on the list.
2. Window AC Units in Vacant or Common Apartments
Here's the one nobody talks about. Tenants leave window units running when they go on vacation. Supers run units in basement offices. Vacant apartments getting shown have ACs blasting for the broker walkthrough and never get shut off.
A 10,000 BTU window unit costs about $1.40 per day to run continuously at current Con Ed rates. Leave three of them running across a summer in a building where you cover electric in common areas? That's $378 in waste over 90 days from a problem you didn't even know existed.
The fix:
- Add a written AC policy to your lease renewals: tenants pay a $25/month surcharge for window units installed outside the May 15-Sept 30 window (legal under NYC law if disclosed)
- Walk vacant units twice a week during showings
- Install smart plugs ($15) on any AC you control — set them to shut off after 4 hours of inactivity
3. Hot Water Recirculation Pumps Running All Summer
Most Bronx multi-families built before 1990 have a hot water recirculation pump that pushes hot water through the riser 24/7 so tenants don't wait. In winter, this is non-negotiable. In summer, it's burning gas and electric for no reason — tenants are taking shorter, cooler showers anyway.
A continuously-running recirc pump costs roughly $40-60/month in electric plus the gas to keep that water hot in the boiler. Over a 4-month summer, that's $400-600 per building.
The fix:
- Install a $30 mechanical timer (your plumber can do it in 20 minutes)
- Run the pump 5am-9am and 5pm-10pm only during June-September
- Tenant complaints: near zero, because incoming cold water is already warm in summer
4. Water Bills From Toilets You Don't Know Are Running
DEP water rates hit $4.62 per 100 cubic feet in 2026 (combined water and sewer). A single running toilet wastes about 200 gallons per day. That's $36/month per leaky toilet, and the average 8-unit Bronx building has 1.5 running toilets at any given time that the tenant hasn't reported because "it's not that bad."
Over a year, that's $650+ in pure waste per building. Across a 4-building portfolio, you're looking at $2,600 you'll never see again.
The fix:
- Order food coloring tablets ($8 for 100 on Amazon)
- During your next routine inspection, drop one in every tank, wait 15 minutes, check the bowl. Color in the bowl = leak.
- Replace flappers ($4 each) on any toilet that fails
This is the kind of thing the DoryAngel Owner Dashboard flags automatically when water bills spike month-over-month — but you can catch it manually if you stay on top of inspections.
5. Boiler Pilots and Standby Losses You're Paying For in July
If you have a steam or hot-water boiler from before 2010, the pilot light and standby losses are costing you gas year-round — even when the heat hasn't kicked on since April. National Grid's 2026 rates have residential gas at roughly $1.85 per therm delivered, and an old boiler can burn 8-12 therms a month just maintaining itself.
That's $60-90/month in gas you're buying for literally nothing between May and September. Over a summer: $300-450 per building.
The fix:
- For domestic hot water only in summer, switch to your boiler's "summer mode" if it has one
- If the boiler is pre-2005, get a quote on a tankless water heater for summer DHW — Con Ed and NYSERDA still have rebates in 2026 covering 20-30% of install costs in the Bronx
- At minimum, have your boiler tech tune the unit every May (cost: ~$200, savings: ~$400/year)
What This Adds Up To
For a typical 8-unit Bronx walkup, fixing all five issues conservatively saves:
- LED + sensors: $1,100/year
- AC controls: $400/year
- Recirc timer: $500/year
- Toilet leaks: $650/year
- Boiler tuning: $400/year
Total: ~$3,050 per building per year. On a portfolio of three buildings, that's over $9,000 in NOI you're leaving on the table — which at a 6% cap rate translates to roughly $150,000 in lost building value.
Do This Before October 1
Summer rates stay elevated through September. Every week you wait is real money out the door. Pick one item this week, one next week, and get all five done before Columbus Day. Your fall financials will look noticeably different — and so will next summer's.