Emerging Trend in HVAC system towards a Green World


  • Green Building movement
  • Energy Efficiency driven by automation (loT etc.). To discuss Ashrae Standard 90.1.
  • Discuss Indoor Air Quality standards and Ashrae 62.1
  • Sustainability


  • Green World” is a term used to describe world of nature and plants.

    The construction industry, together with the materials industries which support it’ is one of the major global exploiters of natural resources, both physical and biological. 



“Green Building” are designed and constructed in accordance with practices that significantly reduce or eliminate the cradle to grave negative impacts of buildings on the environment and occupants in five broad areas:

  • Sustainable Site Planning
  • Safeguarding Water and Water Efficiency
  • Energy Efficiency and Renewable Energy
  • Conservation of Materials and Resources
  • Indoor Environmental Quality


GREEN BUILDING- Energy Efficiency​

Energy Efficiency” If you look at the energy bill of any building, the air conditioning is the main culprit for the high bills. And that is where a lot of time the green is often misunderstood as something to do with energy efficiency alone.

What evolved in the last two decades, the focus continues to be on energy efficiency in Green rating systems.

GREEN BUILDING- Environmental wellness​

The significance of sustaining “environmental wellness” is a subject that has generated aggravated interest particularly in the last decade and a half.

Issues relating to climate change and global warming and the detrimental effects they could potentially have on our quality of life is also being buttressed by stakeholders.



The need to have “Green environmentally friendly” buildings has led to the creation of not a few International and Certification Agencies the world over that seek to showcase and reward building design and/or upgrades with ratings that show the extent to which any infrastructure in question performs on an environmental scorecard.

These Certification and rating agencies essentially serve as Non-Governmental Agencies (NGOs) and as such seldom have any direct link on policy formulation.

However, they do seek to encourage the following:

  • Social Responsibility. (Better Living Conditions for People)
  • Environmental Stewardship (Planet – Less impact on the environment)
  • Economic Prosperity (profit – reduce the life cycle cost of the building).

GREEN BUILDING- What makes HVAC product Green?​

There is a clear-cut benchmark which should serve as minimum criteria for a HVAC product to be classified as “green”.

Amongst but not exhaustive to this list should be that a Green HVAC Product should seek to be and/or deliver/meet the following criteria:

  • Minimized Energy Use
  • Reduced Embodied Energy
  • Ease of Operation and use
  • Economic lifespan and high recyclable absorption.


Building automation allows for optimization control of HVAC and lighting systems, ensuring they are only in use when necessary.

By implementing demand-based control systems, energy is only consumed when needed.

Predictive maintenance, fueled by real-time monitoring data analytics, allows you to address issues before they become more serious, saving energy and maintenance costs.


Internet of Things (IoT) system consists of sensors/devices which “talk” to the cloud through some kind of connectivity. Once the data gets to the cloud, software processes it and then might decide to perform an action, such as sending an alert or automatically adjusting the sensors/devices without the need for the user.

The benefits of IoT in building automation include improved energy efficiency, enhanced building security, remote access and control, and cost reduction. This means that operators can oversee operations from anywhere in the world, using devices connected to the internet.


Standard 90.1 has been a benchmark for commercial building energy codes in the United States, and a key basis for codes and standards around the world, for almost half a century.

This standard provides the minimum requirements for energy-efficient design of most sites and buildings, except low-rise residential buildings.


Preview 90.1-2022

The 2022 edition of Standard 90.1 incorporates over 80 addenda to the 2019 edition. Major additions appearing for the first time in a minimum-efficiency U.S. model energy standard or code at the national level include:

  • A minimum prescriptive requirement for on-site renewable energy
  • An optional Mechanical System Performance Path allowing HVAC system efficiency tradeoffs based on the new total system performance ratio (TSPR) metric
  • New requirements to address the impacts of thermal bridging



Smart and sustainable approaches to green building construction should incorporate Indoor Air Quality (IAQ) as a critical component of building design.

IAQ is one of the most important determining factors of human health as more than half of the air inhaled by a person during his/her lifetime is at home

Prominent air pollutants found indoors are Volatile Organic Compounds (VOCs), Particulate Matter (PM), Carbon monoxide (CO), Lead (Pb), Oxides of Nitrogen (NOx), and Asbestos.

These pollutants are well-known causative agents of allergies, hypersensitivity, lung infections, and Sick Building Syndrome (SBS).

Several forms of these pollutants are reported to be carcinogenic too.


Usage of low-VOC emitting building materials, interior components, and paints needs to be emphasized to create a wholesome indoor environment.

IAQ is controlled by removal of the contaminant or by dilution.

Strategies for ample ventilation, efficient distribution of fresh air supply, properly designed Heating, Ventilation, and Air Conditioning (HVAC) system.

At a reasonable energy cost, maintaining good IAQ is incorporated by notable green-building certification systems like LEED and GRIHA.


Standard 62.1 specifies minimum ventilation rates and other measures intended to provide indoor air quality (IAQ) that’s acceptable to human occupants and that minimizes adverse health effects.

The standard provides procedures and methods for meeting minimum ventilation and IAQ requirements to engineers, design professionals, owners, and jurisdictional authorities where model codes have been adopted.


Ashrae define sustainability as “Providing for the needs of the present without detracting from the ability to fulfill the needs of the future.”

“Sustainability” as described by (Kilbert J.) can be summarized as; meeting the needs of the present without compromising the ability of future generations to meet their needs. Thus, ethical and environmental responsibilities are critical factors to consider.

By the year 2040, the world population will increase by another 1.8 billion people.

By that same year, there will be a 48 percent increase in the consumption of marketed energy.

By 2050, 70% of the world population will live in urban areas.

Airborne threats such as carbon emissions, greenhouse gases, infectious airborne diseases and flammable refrigerants can affect the health of our ever-growing population.

SUSTAINABILITY. Ashrae Lead the Charge

ASHRAE’s commitment to furthering energy efficiency guidance in achieving net zero energy buildings makes a possibility a reality.

ASHRAE’s new global headquarters will showcase the latest equipment, systems and technology for visitors to see sustainability in action.

ASHRAE’s new global headquarters will be the hub for the development of building solutions for a healthier world.

We are Mandilas…committed to you!

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Iyabusola Olorunfemi

General Manager, Legal Adviser/Company Secretary

Iyabosola Olorunfemi is the General Manager, Legal Adviser /Company Secretary of Mandilas Groupof Companies Limited.

Iyabosola is a lawyer with a wealth of experience in Legal practice. She graduated from University of Lagos where she obtained a Bachelor’s Degree in Law (LL.B), then proceeded to the Nigeria Law School where she obtained a Bachelor at Law (B.L). She is also a Chartered Company Secretary from the Institute of Chartered Secretaries and Administrators of Nigeria (ICSAN).

She has over 18 years of Corporate and Commercial Law experience spanning the Oil & Gas, Power, Mobility & Cooling Industry, alongside Company Secretarial, Corporate Governance, Regulatory and Compliance.

In the course of her career, she worked with Oando Plc, an integrated Oil and Gas Company for several years where she garnered the knowledge and skills as she rose through the ranks, in the Upstream, Mid-stream, Downstream and Power value chain of the Oil and Gas sector. She later joined IBILE Oil and Gas Corporation (IOGC), a State-owned entity as the pioneer Legal Adviser/ Company Secretary, where her immense value and contribution to the growth of the business and Board were recognised.

She has attended a number of Management and Commercial negotiation training from University of Dundee Scotland, Oxford Princeton London, Lagos Business School, Rocky Mountain Mineral Law Foundation Houston, Texas as well as Euromoney UK Legal Training.

She is a member of the Nigerian Bar Association (NBA) and an Associate Member of the Institute of Chartered Secretaries and Administrators of Nigeria (ICSAN).

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Email: customercare@mandilasng.com

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About Mobility

Mandilas Motors has been a household name in the Nigerian Automobile industry for close to 70 years.

The Volkswagen brand was introduced to Nigeria by the company in the ’50s; even before the establishment of the Volkswagen Assembly plant in Nigeria. Mandilas was later involved in the distribution of other brands like Audi,Peugeot, Nissan, Daihatsu, Honda, Kia, and subsequently re-introduced the Skoda brand into Nigeria in the late ’90s.

The company is currently one of the accredited Toyota dealers in Nigeria, and a major player at that, with many awards to show for it since 2003. The Leasing unit is involved in fleet management and vehicle leases.

Brand New Vehicles:
Mandilas New Car Sales Department is one of the leading accredited Toyota Distributor in the country.

We are a major player in the sales of new Toyota vehicles in Nigeria. All new vehicles sold are backed up with a three year or 100,000km (whichever comes first) Manufacturer’s warranty; with the option of a Service plan offered with every new vehicle sold.

Various incentives are offered to our customers; and these include free registration, accessories, free service and much more based on terms and conditions of the sale.


Who we are

Mandilas Group Limited is an iconic Nigerian brand founded by John Basil Mandilas.

Our mission is to be the first-choice provider of quality and professional lifestyle solutions in Nigeria.

We are a company of ideas nurtured by a commitment to our clients.

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Marie-Therese Phido

General Manager, Sales & Marketing

Marie-Therese Phido has over 25 years’ experience working in Business Development, Strategy, Sales & Marketing, Brand Management and Corporate Communication. She worked for the foremost professional services firm in Nigeria, KPMG where she started her career and rose to the position of Associate Director and Head Sales & Markets for West Africa.

She then moved on to Deloitte as Director, West Africa Clients and industries Leader (Partner level), where her role involved coordinating business development and sales targeting for the region and working with teams and C-level executives across the region to actively secure medium to long term financial growth and strategic goals for the firm.

She is currently the General Manager, Sales and Marketing of Mandilas Group Limited, a leading indigenous trading and services conglomerate.

Marie-Therese is an alumnus of the London Business School, Harvard Business School and the Lagos Business School. She is also a member of the Chartered Institute of Marketing and the Institute of Directors. She has conducted several projects in strategy and go-to-market strategy, business growth, training sessions on sales & marketing, business development, business activation, branding, innovation, and customer service.

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Head of Treasury

Obi Chilo-Offiah is a vastly skilled Finance professional with expertise in Budgeting and Forecasting, Auditing and Financial reporting, Risk Management, Investment Analysis, Portfolio Management and Operations Management amongst others.

Obi joined the Mandilas Group as the Head of Treasury in 2020 and preceding this, he served as a Wealth manager and Private Banker with the First Bank of Nigeria in Private Banking, as the Audit Senior in the Asset Management Group in McGladrey, LLP Stamford, as an Associate who then progressed to be Manager at The Siegfried Group, LLP in New York; and in Deloitte & Touché LLP, Stamford as an Accountant who progressed to Associate and then Audit Senior.

He is the founder and the principal Partner of the Equinox Group Limited with a Bachelor’s degree in Business from the University of Hartford, USA.

Tunde Okeremi

General Manager, Cooling

Engineer Tunde Okeremi is a highly dynamic and result oriented professional with over 2years of progressive management experience mainly in the Oil and Gas and IT industry. She has effectively led and managed multi-discipline teams to deliver projects on time and within budget in the America, Asia, Europe and Africa. She continuously utilizes her leadership and communication skills to make sure that the goals and objective of the projects are well understood by all stakeholders and the executive management/client is carried along.

Client satisfaction is of topmost priority, so short and long- term analytical projections and a bird’s eye-view for a successful completion is a must for all her projects.

Engineer Tunde has extensive work experience in Deepwater Subsea, Topsides and Drilling Controls. She worked in engineering and project management roles in Subsea controls, intervention, surveillance for Shell USA and Nigeria; and as Drilling Controls Consultant for Exxon Mobil and Total in Offshore Norway, North Sea; Singapore and Offshore Brunei where she managed pre-commissioning, commissioning, system integration, startup for new and overhauled drilling rigs.

Engineer Tunde Okeremi has a Bachelor’s degree in Electrical Engineering from the University of Ilorin Nigeria, Masters in Business Administration (MBA) from Houston Baptist University, Texas US and Masters of Science (M.Sc.) in Electronics Communication and Computer Engineering from Nottingham University UK. She is a seasoned administrator and innovative leader.

Engineer Tunde Okeremi is a Member of the Institute of Electrical Electronics Engineers (IEEE), Professional Member of the Nigerian Society of Engineers (NSE), Registered Member Council for the Regulation of Engineering in Nigeria (COREN), Member, Society of Petroleum Engineers (SPE), Member Society of Women Engineers (SWE), Member Women in Energy Network (WEN).

Fatosin Anna

Head, Group Human Resources

Fatosin Anna is a seasoned Human Resources and Administration Manager with over twenty years’ experience.

She holds a Bachelor’s degree in Sociology and a Post Graduate degree in Industrial Relations and Personnel Management from the University of Lagos.

She is a Member of the Chartered Institute of Personnel Management of Nigeria (CIPMN) and a professional member of the Society of Human Resources Management amongst many other certifications. With proficiency in all key aspects of Human Resources Management, she has worked with top talents of several industrial sectors hence a versatile professional in the field.

She has served in ValuCard Nigeria Plc, Bell Oil and Gas Limited, Cakasa (Nigeria) Company Limited, RadissonBlu Anchorage Hotel, Swift Networks Limited, Shorelink Oil and Gas Limited as the Human Resources and Administration Manager, before joining the Mandilas Group in 2019 where she holds the position of the Head of Human Resources.

Pal Singh

Chief Operating Officer

Pal Singh is the General Manager of the Air-conditioning division.

Qualified as HVACR engineer, he is a member of the American Society of Heating, Refrigeration and Air-conditioning Engineers. Pal has 28 years’ experience in large Air-conditioning and ventilation equipment from different Companies across the globe.

He is an expert in latest and advanced technology of HVACR engineering which is a unique service that aligns comfort and technology for Corporates.

Temilade Olumide

Group financial Controller

Temilola Olumide, a Fellow of the Institute of Chartered Accountants (ICAN) with over thirty (30) years’ experience across professional accounting practice, financial institutions, telecoms, oil marketing and security organizations. She joined Mandilas Group Limited as Head, Internal Audit, Risk & Compliance in January 2022 from De Tastee Fried Chicken Limited where she worked as the Finance Controller.

Temilola holds a B.Sc degree in Economics from University of Ibadan, Ibadan. She started her working career as an Articled Clerk in Coopers & Lybrand (now Price Waterhouse Coopers). Her previous work experience were at G4S Secure Solutions Nigeria Limited, Forte Oil Plc (formerly African Petroleum Plc), Motorola Nigeria Limited, United States Agency for International Development – (USAID) – Office of Transition Initiatives.

Temilola’s experience includes leading the Finance function in various business transformation and corporate restructuring initiatives that delivered significant improvement to Revenue, Net Profit and thus ROI performance.


Daisi Omidiji

Chief Commercial Officer

Daisi is a professional accountant with over 20 years’ experience across the broad spectrum of corporate finance.

He was Company Treasurer and rose to Head of Corporate Planning and Strategy at Promasidor Nigeria and later joined Timeless Holdings Ltd as the Chief Operating Officer. Prior to this, he had worked with MBC International Bank

He holds a B.Sc. degree from the Obafemi Awolowo University and an MBA from the University of Benin.

He is a Fellow of the Institute of Chartered Accountants of Nigeria and the Chartered Institute of Taxation of Nigeria.

He’s also a project manager – a PRINCE 2 Registered Practitioner and an Executive Master’s Certificate holder in Project Management from the Project Management College, UK. A member of many professional bodies both in Nigeria and UK

Ola Debayo-Doherty

Group Chief Executive Officer (C.E.O)

OLA DEBAYO-DOHERTY joined Mandilas in 2018 as the Group Chief Executive Officer charged with leading the company through its restructuring exercise. She is the first African to attain the position since the Group started operations 70 years ago.

Ola joined the Mandilas Group from IBILE Oil and Gas Corporation where she was the pioneer Managing Director/Chief Executive Officer. Prior to this role, she was at Shell Petroleum Development Company of Nigeria Limited, Shell International, United Kingdom and Arthur Anderson where she served in Finance, Management Consulting, Strategic Business Development and Project/Process Management functions at senior and management levels in and outside Nigeria.

She is a strong program and project management professional with a Master of Business Administration (M.B.A) from Canisius College (USA) and Bachelor of Science (B.S.) Accounting degree from D’Youville College (USA).

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