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A year-round warming shelter needs a coordinated plan for winter heating, summer cooling, ventilation, filtration, accessibility, controls and emergency operations—not simply a furnace and a room. Start by defining whether the facility is a daytime warming center or an overnight shelter, then apply local building, mechanical, fire and accessibility requirements to the expected occupancy, climate and hazards. The design should keep occupied areas thermally comfortable, maintain acceptable indoor air quality, and remain safe during smoke events, extreme heat, cold snaps and power outages.
This guide lays out a planning framework for municipalities, community organizations, facility operators and construction teams. It is not a substitute for project-specific code review, HVAC calculations or stamped engineering.
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What is the facility supposed to do?
Define the service model before selecting equipment. A daytime warming center provides temporary relief from cold; it may operate for set hours and close overnight. An overnight emergency shelter has different sleeping, sanitation, security, staffing and ventilation demands. Massachusetts guidance describes a warming center as a daytime gathering place rather than an overnight shelter, with a heated public building, bathrooms, accessibility and generator backup. Those recommendations are Massachusetts-specific, so confirm the applicable rules with your jurisdiction.
Write a short operating brief that answers:
- Will people sleep there, or only visit during operating hours?
- What are the normal and peak occupancies, and will children, older adults, people with disabilities, or medically vulnerable people use the space?
- What hours and seasons will it operate?
- Will pets, service animals, personal belongings, meals, charging stations or medical support be accommodated?
- Which hazards are plausible locally: prolonged cold, heat waves, wildfire smoke, flooding, storms, poor outdoor air quality or utility outages?
- Which rooms must remain usable if part of the building is closed?
These answers determine zoning, toilets, storage, staffing, filtration priorities, backup power and the amount of space that must remain conditioned.
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How do you establish the design brief and code path?
Confirm occupancy classification and all applicable local requirements before layout or equipment decisions. The authority having jurisdiction may apply separate building, mechanical, electrical, plumbing, fire-protection, energy and accessibility provisions. A shelter can trigger requirements that differ from an ordinary community room, office or assembly space.
Have the design team document:
- Occupancy and room uses: sleeping, reception, queuing, dining, first aid, isolation, staff, storage and sanitation.
- Climate data: winter and summer design conditions, humidity, solar exposure, prevailing winds and smoke or pollution patterns.
- Operating scenarios: normal operation, maximum attendance, reduced staffing, smoke alert, extreme heat, extreme cold and utility failure.
- Required resilience: which loads need generator or other emergency power, how long the building must operate, and how fuel will be stored safely.
- Maintenance capability: who changes filters, checks alarms, logs temperatures, responds to faults and authorizes emergency operating modes.
Do not set an occupancy limit, ventilation rate, heating capacity or generator size from a generic online rule. Those values depend on the approved code path, room geometry, equipment, climate and expected use.
What temperature should a warming shelter be?
Use a jurisdiction-approved comfort target, then verify comfort across the occupied zone rather than relying on one thermostat. Toronto’s 2023 Shelter Design and Technical Guidelines specify a heating-season indoor design temperature of 22°C (71.6°F) and adequate air conditioning to maintain occupied areas at 24°C (75.2°F) in summer. These are Toronto guidance values tied to its regulatory context, not universal shelter requirements. The same guidance says that if air conditioning is not provided, a cooling centre or room must be provided.
The CDC shelter assessment form uses winter and summer operative-temperature ranges attributed to ASHRAE: approximately 68.5–75°F in winter and 75–80.5°F in summer. Treat these as an assessment reference, not a national code. Confirm the target with the local authority, the project engineer and the facility’s population and operating model.
Temperature alone does not define comfort. ASHRAE Standard 55-2023 explains that air temperature, radiant temperature, humidity, air speed, activity and clothing interact. A room can meet a thermostat setpoint yet feel cold near a window, hot under a roof, drafty at a diffuser or oppressive when humidity is high. Design and commission for the occupied zone, not just the control sensor.
How should the building envelope be assessed?
An efficient HVAC system cannot compensate for a leaky, poorly insulated or moisture-damaged envelope. For an existing building, complete a condition survey before deciding whether to retain or replace equipment.
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- Roof, wall and floor insulation; thermal bridges; and areas where insulation is missing or compressed.
- Windows, doors, frames, weather-stripping and automatic closers, especially at high-traffic entrances.
- Air leakage at loading doors, penetrations, service chases, electrical rooms and roof or wall joints.
- Water intrusion, condensation, mold risk and drainage around the foundation and roof.
- Solar exposure, shading, glazing area and roof color, which affect summer cooling loads.
Seal uncontrolled leakage and repair water problems before sizing new equipment. Add vestibules, door closers or air-lock strategies where repeated entry would otherwise drive heat loss or heat gain. In summer, exterior shading and solar-control glazing can reduce cooling demand without reducing outdoor air.
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Check the existing mechanical and electrical systems
Record equipment age, fuel, capacity, controls, service history, distribution, electrical demand, filter dimensions and available space for upgrades. A modest renovation may be constrained by existing ducts, shafts, roof structure, electrical service or equipment that is near the end of its service life. New construction generally offers more HVAC choices and better opportunities to coordinate ducts, plant rooms, controls and backup power from the start.
Which HVAC approach fits a year-round shelter?
There is no single best system. Compare options against comfort, ventilation, air quality, capital cost, energy use, emissions, operating cost, control, maintenance and outage behavior. Toronto’s guidance specifically identifies ventilation effectiveness, comfort, energy efficiency, greenhouse-gas reduction, operating cost, ease of operation, and monitoring and maintenance as selection considerations.
| Design situation | Potential advantage | Key constraint to resolve |
|---|---|---|
| New construction with a central air system | Space and distribution can be coordinated for outdoor air, filtration, zoning and controls. | Requires early engineering coordination, adequate plant space and a resilient power strategy. |
| Existing building with serviceable central equipment | May reduce capital disruption when ducts, electrical service and controls can support the required operation. | Filter pressure drop, outdoor-air capacity, remaining equipment life and limited zoning may restrict improvements. |
| Renovation with inadequate or obsolete equipment | Replacement can correct comfort, ventilation and reliability issues together. | Construction phasing, temporary shelter arrangements, electrical upgrades and budget must be planned. |
| Dedicated cooling room or center | Provides a defined refuge when full-building air conditioning is not feasible. | Must be sized, accessible, staffed and supplied with safe ventilation and emergency procedures. |
Do not treat portable heaters or room air conditioners as a complete design. They can create uneven temperatures, overload circuits, obstruct exits or fail during an outage. If temporary equipment is unavoidable, use a qualified professional to verify clearances, electrical loading, condensate management, controls and fire safety.
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How much ventilation and filtration does a shelter need?
Ventilation and filtration solve different problems. Outdoor air dilutes internally generated contaminants; filtration removes particles from recirculated air. Neither replaces source control, cleaning, isolation procedures or appropriate occupancy management.
APIC’s disaster-shelter guidance advises consulting an HVAC professional, meeting applicable occupancy codes, increasing outdoor air when feasible and selecting the highest-efficiency filter compatible with the system. It identifies MERV 13 or better as a feasibility-based target and notes that portable HEPA units can supplement the building system. Limited portable units should be prioritized for medical, first-aid, quarantine and isolation spaces. The guidance also cautions that HVAC improvements can reduce infection risk but do not eliminate it.
During normal operation, the engineer should verify outdoor-air delivery, distribution, exhaust, pressure relationships and ventilation effectiveness for each room type. Reception, toilets, food areas, sleeping rooms, isolation spaces and janitor rooms may need different pressure or exhaust strategies. Keep outdoor-air intakes away from vehicle exhaust, generator exhaust, loading areas and other contamination sources.
Portable HEPA units are a supplement, not a substitute for code-required ventilation. Place them where airflow will not be blocked, secure cords against trip hazards, document filter changes and avoid locating the discharge directly at a person’s face. Select units whose airflow and noise are appropriate for the room; the exact clean-air delivery requirement must be established for the space and equipment.
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How should the shelter operate during wildfire smoke or other outdoor-air events?
Smoke response requires a planned operating mode because the best setting for ordinary ventilation may not be best when outdoor fine-particle levels are high. EPA emergency indoor-air guidance recommends using a MERV 13 filter, or the most efficient filter the HVAC system can accommodate, and using recirculation settings to keep particles out when appropriate.
- Monitor official local air-quality and smoke advisories.
- Confirm which rooms can be served with recirculated, filtered air and which exhaust systems must remain on for sanitation or safety.
- Change to the approved smoke setting only through trained staff or an automated control sequence.
- Keep exterior doors and windows closed when outdoor smoke is the hazard, while preserving required egress and life-safety functions.
- Check filter loading and fan operation; a higher-efficiency filter can increase resistance beyond what an older fan can handle.
- Reassess the building when outdoor conditions improve and return to normal outdoor-air settings under the written procedure.
Do not improvise by disabling exhaust, sealing required relief paths or exceeding equipment limits. The engineer should document the trade-off between outdoor-air intake, pressure, filtration, temperature and humidity for each system.
How can a shelter stay cool in summer?
Plan for heat before the first hot-weather opening. Cooling loads rise with occupancy, lighting, equipment, solar gain and outdoor humidity. A building that feels acceptable in spring may overheat when every seat is occupied and doors are opening repeatedly.
- Provide properly sized mechanical cooling where the code and service model require it, or designate an accessible cooling room or center when full-building air conditioning is not provided.
- Zone spaces with different schedules or loads so an empty office does not dictate the temperature in a crowded common room.
- Use solar shading, reflective roof strategies, insulated roofs and airtight construction to reduce heat gain.
- Control humidity as well as dry-bulb temperature; high humidity can make a room feel warmer and create moisture problems.
- Provide shaded, accessible waiting areas and water access, with procedures for recognizing and escalating heat illness.
- Verify that cooling equipment can restart safely after a power interruption and that condensate drains will not create slip or sanitation hazards.
Where a dedicated cooling room is the fallback, identify its location on public notices, keep routes accessible, provide seating and toilets, and establish staffing and opening triggers. A cooling room is an operational service, not merely a spare room with a small air conditioner.
What should happen during a power outage?
Outage planning must address more than keeping the room warm. Loss of power can stop heating or cooling, reduce outdoor-air delivery, disable filtration, interrupt pumps and lighting, and leave alarms or communications without power.
Create an outage matrix that identifies which systems operate on emergency power and for how long:
- Life-safety alarms, emergency lighting, fire pumps and required communications.
- Heating or cooling serving the refuge area.
- Ventilation, exhaust and filtration needed for sanitation or designated isolation spaces.
- Refrigeration or medical equipment, if the shelter provides those services.
- Access control, elevators or other accessibility-critical equipment.
Fuel-powered portable generators must never operate indoors, in a garage or near openings where exhaust can enter. EPA says to place them outdoors at least 20 feet from buildings and to install and maintain working carbon-monoxide alarms. Keep generator exhaust away from outdoor-air intakes, doors and windows. Have a licensed professional determine connection methods, transfer equipment, grounding, fuel storage and load limits.
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Write separate cold-weather and hot-weather outage procedures. They should specify when to open or close the facility, how to relocate occupants to the refuge area, how to monitor indoor temperature and air quality, how to communicate with emergency services, and when to evacuate. Never use cooking appliances, charcoal devices or unapproved fuel-burning heaters for space heating.
How do accessibility, sanitation and room layout affect comfort?
Thermal comfort is inseparable from how people move through and use the shelter. Provide step-free routes, accessible toilets, adequate turning space, seating with and without arms, clear queuing areas and refuge locations that do not block exits. Keep diffusers, portable air cleaners, radiators and cords out of accessible paths.
Separate noisy mechanical equipment from sleeping or quiet areas. Locate first aid and isolation rooms where they can receive prioritized filtration and appropriate pressure control without forcing occupants through crowded areas. Provide handwashing, drinking water, waste storage and cleaning space sized for peak use. Use durable, cleanable finishes that tolerate frequent disinfection without creating slip hazards.
Entrances deserve special attention: vestibules reduce drafts and heat gain, while automatic doors and door hardware must remain usable by people with limited strength or mobility. Avoid concentrating all seating directly beneath supply diffusers or beside exterior doors, where air speed and radiant temperature can make occupants uncomfortable even when the thermostat reads correctly.
What controls and monitoring should be installed?
Controls should make the safe operating choice the easy choice. Provide schedules and setpoint limits appropriate to the service model, lockouts against unauthorized changes, alarms for equipment failure and clear labels for normal, smoke and outage modes.
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At minimum, assign responsibility for recording:
- Indoor temperature in occupied areas.
- Humidity where moisture or comfort makes it relevant.
- Outdoor-air and smoke conditions used to select operating modes.
- Filter condition, replacement date and any high-static-pressure alarm.
- Generator status, fuel, transfer operation and alarm tests.
- Smoke alarms, carbon-monoxide alarms, sprinklers, fire extinguishers and fire-alarm status.
The CDC shelter assessment guide calls for checking working HVAC, adequate ventilation, indoor temperature and the presence and unexpired status of carbon-monoxide alarms, smoke alarms, fire extinguishers, sprinklers and fire alarms. Use those checks as an operational baseline, adding items required by local code and the equipment manufacturers.
What is the step-by-step design process?
- Define the service level. Decide daytime warming center, overnight shelter or a combination, and document hours, occupancy, population needs and room uses.
- Map hazards and climate. Identify winter design conditions, summer heat, humidity, smoke, flooding, storms and likely utility failures.
- Confirm the code path. Meet with the authority having jurisdiction and identify occupancy, fire, accessibility, mechanical, electrical, plumbing and energy requirements.
- Survey the building. Assess the envelope, moisture, windows, doors, ducts, equipment, electrical service, controls, roof capacity and remaining service life.
- Set comfort and air-quality criteria. Select jurisdiction-appropriate temperature, humidity, outdoor-air, filtration, pressure and monitoring requirements with the engineer.
- Develop HVAC options. Compare new construction and retrofit constraints, zoning, ventilation, filtration, energy, emissions, operating cost, maintenance and outage performance.
- Design emergency modes. Document smoke, heat, cold and outage sequences; refuge rooms; generator loads; safe shutdown and reopening criteria.
- Coordinate architecture and operations. Integrate vestibules, accessible routes, toilets, quiet areas, first aid, isolation, storage, cleaning and staff sightlines.
- Commission before opening. Test controls, sensors, outdoor-air delivery, filtration, heating, cooling, alarms, generator transfer, emergency lighting and room-by-room comfort under representative conditions.
- Train and maintain. Give staff simple checklists, escalation contacts, filter and alarm schedules, and written instructions for every emergency mode.
What should the maintenance and inspection program include?
Design access for maintenance: provide safe filter-change clearance, labeled dampers and valves, reachable sensors, drain pans that can be cleaned, roof access where required, and service areas that do not require entering occupied sleeping or medical rooms.
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- Inspect filters at a frequency based on loading, outdoor conditions and manufacturer requirements; replace them with a compatible efficiency and size.
- Check heating and cooling operation before each season and after major repairs.
- Verify outdoor-air dampers, exhaust fans, economizer sequences and smoke-mode controls.
- Clean coils, drain pans, grilles and portable HEPA units according to manufacturer instructions.
- Test smoke and carbon-monoxide alarms, fire alarms, sprinklers, extinguishers and emergency lighting; record expiry dates.
- Exercise generators and transfer equipment under an approved maintenance plan.
- Review temperature logs, complaints, hot or cold spots, condensation and unusual energy use for corrective action.
Commissioning is not a one-time handover. Recommission after major occupancy changes, envelope work, equipment replacement or a serious smoke or outage event.
What common design mistakes should be avoided?
- Using one thermostat as proof of comfort: survey occupied-zone conditions and radiant or draft complaints.
- Copying a temperature from another city: treat Toronto’s 22°C and 24°C values as Toronto guidance, then verify local requirements.
- Adding a high-efficiency filter without checking the fan: confirm pressure drop, airflow and motor capacity first.
- Assuming filtration replaces ventilation: maintain required outdoor air and source-control measures.
- Closing outdoor-air intakes during smoke without a written sequence: preserve sanitation, pressure and life-safety functions while using the engineer-approved smoke mode.
- Buying a generator before identifying loads: calculate essential circuits, transfer equipment, fuel logistics and exhaust location.
- Leaving emergency procedures to opening day: train staff and exercise heat, cold, smoke and outage scenarios before the shelter is needed.
- Ignoring maintenance access: inaccessible filters, sensors and drains turn a good design into an unreliable facility.
How do you know the shelter is ready to open?
Use a documented readiness review. The building should have an approved occupancy and fire-safety path; functioning heating and cooling or an identified cooling refuge; verified outdoor-air and filtration operation; accessible toilets and routes; tested alarms and emergency lighting; safe generator arrangements; current emergency contacts; trained staff; and written smoke, heat, cold and outage procedures.
Record baseline temperatures in representative occupied zones, not only at the control panel. Confirm that doors, diffusers, portable units and furniture do not obstruct egress or accessible paths. Give operators a simple log and escalation process so a failing system is reported before conditions become unsafe.
A year-round shelter succeeds when the envelope, HVAC, controls, operations and maintenance are designed as one system. The construction team’s role is to preserve that coordination from early survey through commissioning and seasonal operation.
Frequently Asked Questions
Can an existing community building be converted into a year-round warming shelter?
Often, but feasibility depends on the building’s envelope, electrical service, ducts, equipment life, exits, toilets, accessibility and available space for filtration and controls. A condition survey and code review should come before committing to a renovation budget or occupancy level.
Is a portable HEPA purifier enough for a warming shelter?
No. Portable HEPA units can supplement central ventilation and filtration, especially in medical or isolation spaces, but they do not provide required outdoor air, exhaust or humidity control. Select and place them with an HVAC professional and keep them maintained.
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Follow the written heat or cold procedure: verify readings with an independent instrument, check equipment and alarms, move people to the designated refuge area if available, notify the responsible operator and emergency contacts, and close or evacuate the facility when the approved safety threshold or authority direction requires it.
How often should shelter HVAC filters be changed?
There is no universal calendar interval. Inspect loading and pressure, then follow the equipment and filter manufacturer’s requirements while accounting for occupancy, construction dust, smoke and outdoor pollution. Keep a written replacement log and confirm that the replacement filter is compatible with the system.
Do warming centers need generators?
The required backup depends on local code, the service model, hazards and which systems must remain operational. Plan emergency power for identified life-safety, communication, refuge-area and essential mechanical loads, and have a qualified professional address transfer equipment, fuel and exhaust safety.
