Stifel Nicolaus 2017 Industrials Conference June 15, 2017

Forward-Looking Statements This material and related presentation may contain certain forward-looking statements within the meaning of the Private Securities Reform Act of 1995. Any such comments are based upon information available to EMCOR management and its perception thereof, as of this date, and EMCOR assumes no obligation to update any such forward-looking statements. These forward-looking statements may include statements regarding market opportunities, market share growth, gross profit, backlog mix, projects with varying profit margins, and selling, general and administrative expenses. These forward-looking statements involve risks and uncertainties that could cause actual results to differ materially from the forward-looking statements. Accordingly these statements are no guarantee of future performance. Such risk and uncertainties include, but are not limited to, adverse effects of general economic conditions, changes in the political environment, changes in the specific markets for EMCOR’s services, adverse business conditions, availability of adequate levels of surety bonding, increased competition, unfavorable labor productivity and mix of business. Certain of the risks and factors associated with EMCOR’s business are also discussed in the Company’s 2016 Form 10-K and in other reports filed from time to time with the Securities and Exchange Commission. All these risks and factors should be taken into account in evaluating any forward-looking statements.  

EMCOR Group Leading specialty construction, building and industrial services provider 2017 estimated revenues $7.5B - $7.6B ~34,000 employees

Significant expertise in project execution and service delivery Why EMCOR Significant expertise in project execution and service delivery Excellence in managing skilled labor Disciplined and effective cost management Broad array of services delivered into growing end markets Platform for earnings growth Strong and liquid balance sheet Flexibility for organic growth, acquisitions and share repurchases History of consistent cash generation Cash flow ± net income

EMCOR GROUP, INC. Leading Market Position Across all Businesses 2016 Revenue: $7.6B CONSTRUCTION SERVICES EMCOR UK 2016 Rev: $0.3B U.S. MECHANICAL CONSTRUCTION 2016 Rev: $2.7B U.S. ELECTRICAL CONSTRUCTION 2016 Rev: $1.7B U.S. BUILDING SERVICES 2016 Rev: $1.8B U.S. INDUSTRIAL SERVICES 2016 Rev: $1.1B

CONSTRUCTION – U.S. Leading Specialty Construction Contractor Sheet Metal HVAC Process Piping Fire Protection High Purity Piping Plumbing Low Voltage Voice & Data Lighting Security / Alarm Transmission & Distribution High Voltage

BUILDING SERVICES – U.S. Leading National Provider of Building Services National HVAC Services Building Control Systems Retrofit Projects Repair Services Service Agreements Operations & Maintenance HVAC Services Retrofit Projects Preventative Maintenance Energy Efficiency Upgrades Base Operations Facilities Management IDIQ Projects Operations & Maintenance Supplier Management

Leading Provider of Refinery / Petrochemical Turnaround Services U.S. Industrial Services Leading Provider of Refinery / Petrochemical Turnaround Services Heat Exchanger Service / Fabrication Embedded Contracts Turnaround Services Heat Exchangers, including HF Alky Units Fluid Catalytic Cracking Units Coking Units Specialized Welding Field Services Maintenance Capital Projects

Balanced Revenue Distribution Source Geography 14% 4% 34% 31% 96% 21% ($ Millions) 2016 Revenues $7,226 326 $7,552 U.K. United States ($ Millions) 2016 Revenues New Construction $2,524 1,586 2,375 1,067 $7,552 Retrofit & Renovating Building Services (Incl. UK) Industrial Services

Service Revenue is Growing as a Percent of Total Revenue ($ Millions) ~$7,600 ~$7,500 - $7,552 2016 service revenue $3.4 billion or 45% Recurring service revenue base under more cyclical construction business $6,719 $6,195 $6,334 $6,425 $5,450 $4,698 45% 49% 48% 45% 45% 45% 42% Service Construction

Backlog by Market Sector ($ Millions) $3,903 $3,974 $4,000 $3,000 $2,000 $1,000 $0 $3,771 $3,634 $3,302 $3,344 $3,224 $2,953 2010 2011 2012 2013 2014 2015 2016 2017 – Qtr. 1 Commercial Hospitality Industrial Healthcare Institutional Transportation Water & Wastewater

Backlog by Segment Mechanical Electrical Building Services ($ Millions) $3,903 $3,974 $4,000 $3,000 $2,000 $1,000 $0 $3,771 $3,634 $3,302 $3,344 $3,224 $2,953 2010 2011 2012 2013 2014 2015 2016 2017 – Qtr. 1 Mechanical Electrical Building Services Industrial Services EMCOR UK

Key Financial Data – Income Statement ($ Thousands, except per share information) (Unaudited)

Key Financial Data – Balance Sheet ($ Thousands)

Non-residential construction market expected to grow mid-single digits 2017 Outlook Non-residential construction market expected to grow mid-single digits Backlog growth positive for Domestic Construction Building Services will benefit from continued growth in retrofit and energy savings projects Industrial Services: Solid Spring turnaround season Continued headwinds in “new build” heat exchanger fabrication Strong and liquid balance sheet

2017 Guidance