Is Feng Shui Real? Putting Each Teaching on a Ladder of Scientific Evidence

Quick answer: is feng shui real?

• Feng shui is partly real. Its teachings on daylight, ventilation, humidity, noise and where to sit match what science has measured about human health and psychology.
• Office workers with windows received about 173% more daylight at work and slept on average 46 minutes longer per night (Boubekri et al., 2014).
• Damp and mouldy homes raise respiratory and asthma symptoms by roughly 30% to 50% (meta-analysis by Fisk et al., 2007, used in the WHO 2009 guidelines).
• Feng shui also has real effects through belief: in Greater Vancouver, houses with addresses ending in 4 sold for about 2.2% less and those ending in 8 for about 2.5% more (Fortin et al.).
• The Compass School layers, such as the personal trigram of Eight Mansions and the Xuan Kong flying stars, are traditional knowledge that has not been experimentally tested, because the effect of a facing direction is very hard to separate from dozens of other factors.
• The superstitious part includes promises that buying an object will change your life, fear-based "protection" rituals, and even some myths dressed up as science, such as houseplants cleaning the air of a home.
• The sound approach is to do the proven part first (bright, ventilated, dry, quiet, tidy), treat the untested part as a traditional frame of reference, and drop the superstition entirely.

Hello, my dear readers. The question I hear most often in this profession is not which direction is lucky, nor which object to buy. It is a very blunt one: Master, is feng shui real? I value people who ask that, because they want to understand rather than believe blindly. A practitioner who dodges this question, or answers it with stories of miracles, has not earned the client's trust.

This time I am not answering from feeling. I take the familiar teachings of feng shui one by one, put each of them next to scientific studies with named authors, publication years and numbers, and sort them into levels according to how strong the evidence is. Some teachings are clearly confirmed. Some are only half right. Some turn out to be right in a surprising way. And some I have to call superstition, even if saying so upsets a few people in my own trade. A note for English readers: a few of the in-depth articles linked below are currently available in Vietnamese only.

宅者，人之本。人以宅為家，居若安，即家代昌吉。

"The dwelling is the root of a person. People make the dwelling their home; if they live there at peace, the family will prosper for generations."

Yellow Emperor's Dwelling Classic (Huang Di Zhai Jing)

The opening line of the Yellow Emperor's Dwelling Classic says nothing about charms or sacred animals. It speaks of peace, of living at ease. Take that word as the measuring stick and you will find that most of what genuine feng shui teaches can actually be checked.

1. Asking the right question: which part of feng shui is real

Asking whether feng shui is real is like asking whether traditional Chinese medicine is real. Some of its herbs have been turned into isolated drugs by modern science, some remedies are still being studied, and some claims are baseless rumours. No sensible person throws all of it into one basket and passes a single verdict. Feng shui is the same. It is a large body of knowledge accumulated over more than a thousand years, so the right question is which parts of feng shui are real, how real, and in what way.

To answer it, I use a five-level ladder. The higher the level, the stronger the evidence. You will meet this ladder throughout the article.

2. Level 1: what science has measured

This is the root of feng shui and its most valuable part. Our ancestors had no instruments and no laboratories, but they had a thousand years of watching which kinds of houses kept people healthy and which kinds kept them sick. Those observations were wrapped in the language of qi. When we look at them today with measuring devices, many of them fit remarkably well.

Daylight: a bright home means better sleep

Feng shui favours bright homes full of yang qi and avoids dark, gloomy ones. In 2014, a team led by Mohamed Boubekri and Phyllis Zee (University of Illinois and Northwestern University) followed 49 day-shift office workers, some in workplaces with windows and some in windowless rooms. Their results, published in the Journal of Clinical Sleep Medicine, showed that the window group received about 173% more white light during working hours and slept on average 46 minutes longer per night, with better self-rated quality of life.

The reason is the body clock. Daylight, especially in the morning, is what sets our internal clock. Without it the body confuses day and night: hard to fall asleep in the evening, sluggish in the morning. What feng shui calls abundant yang qi is measured here in lux.

Ventilation: qi must flow

The "feng" in feng shui means wind. The ancients wanted a home to be airy but not draughty, with qi that gathers but does not stagnate. Today we measure this with carbon dioxide, the gas we breathe out every minute. Outdoor air holds about 420 ppm of CO2. A closed bedroom with two people sleeping in it all night can rise above 2,000 ppm.

In 2012, Usha Satish and William Fisk (Lawrence Berkeley National Laboratory) gave 22 people decision-making tests in a sealed chamber at three CO2 levels. At 1,000 ppm, six of nine scales fell significantly. At 2,500 ppm, seven scales fell sharply. In 2016, Joseph Allen's team at Harvard had 24 office workers spend six days in a simulated office: on the days with clean air and high ventilation, cognitive scores were about 101% higher than on conventional office days.

To be complete, I must add this: later experiments, such as one by Xiaojing Zhang and Pawel Wargocki in 2017, found that adding pure CO2 on its own had much weaker effects, while stuffy air full of human emissions and odours clearly reduced concentration. In other words, the culprit is not CO2 alone but stale air as a whole. That fits feng shui even better, because the ancients never pointed at a single gas. They simply said that when qi stagnates, people tire.

Humidity and mould: avoid damp houses

Feng shui strongly dislikes damp, low-lying homes and calls them places of heavy yin qi. In 2009 the World Health Organization published its first indoor air quality guidelines devoted entirely to dampness and mould. The meta-analyses behind them, such as the one by William Fisk and colleagues in 2007, found that damp and mouldy homes raise respiratory symptoms, cough, wheeze and asthma by roughly 30% to 50%.

In northern Vietnam, during the humid nồm spells of late winter and spring, indoor humidity can exceed 90%: walls sweat, floors turn slippery, laundry never dries. That is when feng shui's "heavy yin qi" becomes visible to the naked eye.

Sun and wind: build the house facing south

There is an old Vietnamese saying: marry a gentle wife, build a house facing south. Classical feng shui also prefers a house that sits north and faces south. In Vietnam this has a very clear physical basis. Hanoi lies at about 21 degrees north. At noon in summer the sun stands almost directly overhead, so a modest eave on the south side blocks the harsh light. At noon in winter the sun drops to about 45 degrees above the horizon, and its light slants deep into the house to warm it just when warmth is needed. In summer the cooling southerly and southeasterly breeze blows in through the front, while the bitter northeast monsoon of winter hits the back wall.

In southern Vietnam, where there is no cold winter, the thing to avoid most is the afternoon sun from the west striking glass at the hottest time of day. A house that takes the western sun unshaded still radiates heat at night, and the air conditioner runs flat out. That is why I always tell clients: if a direction looks good on paper but the western sun pours straight into the bedroom, shade it first and talk about lucky stars afterwards.

Noise: the bedroom must be quiet

Feng shui warns against a bed with its head against a busy road, the kitchen or the toilet. Seen with medical eyes, this is about noise and sleep. The WHO Environmental Noise Guidelines for the European Region (2018) recommend that night-time road traffic noise stay below 45 decibels, because above that level sleep is clearly disturbed. People who sleep through noise may not wake, but their bodies still respond with heart rate and stress hormones. The ancients said that stillness nourishes the spirit. The two meet at the same place.

3. Level 2: partial evidence

This level holds teachings that research supports, but with uneven results, or only in certain situations. I call it the "worth doing" zone: it costs little and the benefits outweigh any harm.

A seat with a solid back and a view of the door

Feng shui teaches us to place the bed, the desk and the head of the household's chair in the commanding position: a solid wall behind, a clear view of the door, but not directly in line with it. In 1975 the British geographer Jay Appleton proposed prospect-refuge theory, which holds that people feel safest where they are sheltered from behind and can see widely in front. It reads almost like a copy of feng shui.

Seat A: wall behind, door in view Seat B: back to the door

But I must state it at the right strength. In 2016, Annemarie Dosen and Michael Ostwald (University of Newcastle, Australia) reviewed 34 quantitative studies of this theory. Prospect was confirmed fairly often, in about half of the tests. Refuge, the part about a protected back, gave mixed results, and many studies found no difference. The authors concluded that the evidence remains inconsistent. That is why I put the commanding position on level 2: worth doing, since it costs almost nothing, but not something to treat as sacred.

A view of greenery and open sky

Feng shui values an open "bright hall" in front of the house and lush greenery. In 1984 Roger Ulrich published a small but famous study in the journal Science. He compared 23 pairs of gallbladder surgery patients at a Pennsylvania hospital between 1972 and 1981, matched for age, sex and other factors, who differed only in whether their window looked out on trees or on a brick wall. The tree-view group stayed in hospital 7.96 days on average, the wall-view group 8.70 days, and the tree-view group needed fewer strong painkillers.

The study is small and old, so I place it on level 2. Many later studies of nature and psychology point in the same direction, though. One distinction matters here: greenery is good for the mind, but the idea that houseplants clean the air of a home is a myth, which I will come back to on level 5.

A tidy home, where qi is not blocked

Feng shui sees piled-up clutter as a place where qi stagnates. In 2010 Darby Saxbe and Rena Repetti (University of California, Los Angeles) had couples give recorded tours of their own homes and analysed the words they used. Wives who described their homes with words like cluttered and unfinished showed a flatter daily cortisol curve, a sign of prolonged stress, and their mood became more depressed as the day went on. This is a correlational study of a small group, so it cannot tell us whether clutter causes stress or whether stressed people end up with cluttered homes. But advice to tidy up does no harm. I describe how to do it in the article on decluttering to open the flow of qi (in Vietnamese).

4. Level 3: real because people believe it

This is the most interesting level, and the one that both believers and critics of feng shui tend to overlook. Some things in feng shui have no physical mechanism behind them, yet still have real, measurable effects, measured in money, simply because enough people believe in them.

In 2013 the economists Nicole Fortin, Andrew Hill and Jeff Huang (University of British Columbia) analysed nearly 117,000 house sales in Greater Vancouver, Canada, between 2000 and 2005. Houses whose address ended in 4, a number that sounds like "death" in Chinese, sold for about 2.2% less. Houses ending in 8, which sounds like "prosper", sold for about 2.5% more. The effect appeared mainly in neighbourhoods with an above-average share of ethnic Chinese residents. In those areas, addresses ending in 4 were also noticeably rarer, because quite a few owners had applied to change their house numbers.

The lesson here is very practical. The number 4 is not unlucky in itself, but if you plan to sell to buyers who care about numbers, the house number is a real price factor. I cover house and apartment numbers according to the methods of the profession in a separate article on house, apartment and floor numbers (in Vietnamese).

The other side of level 3 is the power of the mind. Someone who believes their home has been carefully arranged usually feels more at ease, sleeps better and approaches big decisions with more confidence. Conversely, someone who has been told their house is hit by an inauspicious star may spend months in anxiety, and anxiety genuinely damages health. Medicine calls the good side the placebo effect and the bad side the nocebo effect. That is why I consider frightening a client to be an ethical failure, not just a professional one.

5. Level 4: untested traditional knowledge

Here I have to speak plainly, even though it touches my own profession. The Compass School layers of feng shui, including the personal trigram and eight directions of Eight Mansions, the star charts and flying stars of Xuan Kong, and the annual and monthly stars, have not been experimentally tested by science to this day. No experiment large and rigorous enough has shown that East Group people living in east-facing houses are healthier or richer than those in west-facing ones.

That does not mean these systems are meaningless. They are the systematic distillation of many generations of practitioners, with strict rules and an internal logic, and in practice they help a master ask the right questions about a home. But having an internal logic and being proven are two different things. I use them as a frame of reference, the way a physician might use a map of meridians, and I always rank them below form, function and safety.

People ask me about magnetism. A luopan uses a magnetic needle, so does the Earth's magnetic field affect people? In 2019, a team including Connie Wang and Joseph Kirschvink (California Institute of Technology) recorded changes in the alpha brainwaves of some participants when the magnetic field around them was rotated. It is an intriguing finding, but it does not show any effect on health or behaviour, let alone on which house direction suits whom. I mention it so you can see that a serious practitioner does not grab findings like this and claim them as proof.

6. Why feng shui is so hard to test

People often ask me: if feng shui is right, why hasn't anyone simply run the experiment? The answer is that such experiments are extremely difficult, far harder than testing a drug.

There are three main difficulties. The first is confounding. A family in a well-oriented house may also be richer, better educated and living in a better neighbourhood, so it is hard to know what actually produced the result. The second is that blinding is impossible. A drug can be tested against a dummy pill, but residents always know which way their house faces, so their beliefs leak into the result. The third is time. According to the Xuan Kong school itself, fortune and misfortune unfold by 20-year periods, by year and by month, so any study fair to feng shui would need to follow thousands of homes over many years.

The philosopher Karl Popper argued that a scientific theory must be capable of being proven wrong. When a feng shui practitioner explains every outcome after the fact, a good house thanks to a suitable direction, a bad one because of the annual star, an unharmed one because the owner's destiny was strong enough, that explanation can never be wrong, and for that very reason it is no longer science. An honest practitioner must dare to predict what will happen, and accept that he may be wrong.

7. Level 5: superstitions and myths to drop

I write this section to protect you, and to protect the honour of the profession. Feng shui's reputation for superstition comes mostly not from the Book of Burial or the Dwelling Classic, but from the following.

I still use objects when they are appropriate, and I mean no criticism of my colleagues. But I want you to be able to tell measured support from inflated claims made for profit. I have gathered other common mistakes in the article on ten common feng shui misconceptions (in Vietnamese).

8. Feng shui teachings and scientific evidence, side by side

For quick reference, here is everything in one table. The last column is the level of evidence on the ladder in Figure 1.

One thing is worth pondering. From the other direction, architects have also turned towards feng shui. In 2005 Michael Mak and Thomas Ng surveyed architects in Sydney and Hong Kong and reported in Building and Environment that their choices about a building's surroundings and interior layout generally agreed with the ideal model of the Form School. The ancient villages of Xidi and Hongcun in Anhui, whose layout and water systems are tied to feng shui ideas, were inscribed as UNESCO World Heritage in 2000. The form layer of feng shui is therefore seen as a design heritage, not merely a belief.

9. Test the feng shui of your own home

You do not need to take my word for it. With a few inexpensive tools you can measure for yourself what feng shui says about your home. This is the order I recommend, starting from level 1.

1. Measure the light. Install a lux meter app on your phone. A daytime work spot should reach a few hundred lux or more without switching on a lamp. A room that needs the light on at noon is a room short of yang qi.
2. Measure the air. An NDIR-sensor CO2 monitor costs roughly the price of a good dinner out. Leave it by the bed for one night. If the morning reading is above 1,500 ppm, open the window or the door slightly so the air has a way in and a way out.
3. Measure humidity. A cheap digital hygrometer will do. Keep it below 60%. On humid days, close the windows on the side the damp air comes from and run a dehumidifier or the dry mode of your air conditioner.
4. Measure noise. Use a decibel app at the head of the bed late at night. If it regularly exceeds 45 dB, consider moving the bed head to a wall further from the road, or use heavy curtains.
5. Measure the facing. Stand in the centre of the home, away from steel, and use the feng shui compass on your phone to read the direction down to the mountain. Then find your personal trigram to see which directions suit the people who live there. This is level 4, so do it last.
6. Keep a journal. Note the changes you make and how you sleep, your health and your mood over a few weeks. Nothing is more trustworthy than your own home's data.

10. Warning signs of dubious feng shui advice

Whenever you hear feng shui advice, from any master, including me, hold it up against these questions.

• Does it come with fear? Genuine feng shui leaves people reassured and in control. Advice that begins with disaster and ends with an expensive invoice is the first warning sign.
• Can the reason be explained? An honest master can give reasons in terms of form, direction and timing, rather than a vague "do it for luck".
• Does it fix the layout before selling objects? If the master has asked nothing about light, air or damp but already suggests buying a statue, stop.
• Does it promise a certain result? No honest person can promise that placing an object will bring a promotion within three months.
• Does it respect safety and structure? Advice to cut into columns, rebuild stairs against code or block an emergency exit for feng shui reasons is wrong advice, whatever the justification.
• Can it explain everything? A system that always has an explanation after the event but never dares to predict anything beforehand is not as reliable as it claims.

11. Where I stand

So where do I stand, between those who treat feng shui as sacred and those who dismiss it as superstition? I stand where the evidence allows me to stand.

The form layer of feng shui, light, wind, water, humidity, a solid back, a good view, tidiness, is our ancestors' experience of living in harmony with nature, and science confirms more of it every year. I do this part first for every home, and I explain it to clients in the language of both sides. The Compass School layer is a traditional frame of reference, with rules and practical value, but unproven. I use it in moderation, state its limits clearly, and never let it override the safety, health or function of a home. The superstition, I drop.

"Genuine feng shui has nothing to fear from science. Whatever is right, science only makes stronger. Whatever is not yet right, an honest student must have the courage to admit."

Feng shui supports people; it does not do their work for them. A bright, airy, dry, quiet home gives you a good foundation of health and spirit. Success or failure still rests on your own effort, heart and mind. That is also why the ancients ranked feng shui third, after destiny and luck. I cover the foundations of the discipline in full in the article what is feng shui.