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How to Roast Coffee Beans at Home with a Heat Gun

Updated on July 4, 2017
RhondaAlbom profile image

Rhonda is an award-winning travel writer/photographer at AlbomAdventures. Based in New Zealand she has visited 54 countries on 6 continents.

Let Us Show You How to Roast Coffee Beans

Our freshly roasted coffee beans provide us a perfect espresso or latte every day. The flavours come alive and the rich, dark color makes the coffee look nicer. To a coffee lover, there is nothing quite like it.

The thrill starts about half way through the process as the earthy, nutty aroma is released. The nutty, earthy flavor tempts my taste buds long before I will get a sample. But that's okay, we never allow ourselves to run out.

To be honest, roasting our own coffee beans with a heat gun is much easier than we ever imagined; it saves money while providing better flavor. Once you learn this simple method of how to roast coffee beans, you wont want it any other way.

We have studied several home coffee roasting methods and believe this to be the best. It is quick, easy and our total investment was under $20. After a few trials, we have perfected the technique using only a kitchen pot and a heat gun. This page will show you step by step photos of how we roast coffee beans at home. We also added a few video clips so you can hear the sounds the coffee makes at the various stages.

Coffee Beans Start Out Green

There are many different varieties of coffee beans from many different countries. Our criteria is Fairtrade as it protects the grower and our planet. It is not a brand, but rather a way of doing business. For more information check out: Fairtrade Labelling Organization International

Our current favorites come from East Timor, Sumatra or Guatemalan because they a have rich, non-bitter flavor. Trying out different beans is a great way to determine your favorites.

Step 1: Measuring the Coffee Beans

We generally roast about 200 grams (1 ¼ cups) of the green coffee beans at a time which yields us with about 6 delicious double shot espressos or lattes.

Place the green coffee beans into a stainless steel pot or bowl.

Common Kitchen Items (and a heat gun) Are All You Will Need

The tools of the trade are quite simple. For this method of coffee roasting, all you will need are:

1. Heat Gun (best with 2 heat settings) - see just below for our favorite option.

2. Stainless Steel Saucepan

3. Baking Pan (used for cooling)

4. Oven Mitt

5. Wooden Spoon

You Will Need a Heat Gun

Black & Decker HG1300 Dual Temperature Heat Gun
Black & Decker HG1300 Dual Temperature Heat Gun

This one has everything you need for the perfect coffee roast:

* Two heat settings: 700F (375C) and 920F (495C)

* Heat resistant cover and ABS housing

* Soften caulking, putty and form plastics, strips paint, varnish & lacquer

* Includes 4 nozzles

 

Step 2: Find a Spot Outdoors

Roasting beans makes a mess as the light outer layer escapes the beans and scatters all around. We prefer to do this outdoors.

Please Note: The pot will get very hot during the roasting process. You will want to find a spot to place the pot where its bottom won't burn anything. Stones, bricks, concrete or the grill on your BBQ work well.

We use two large stones in a gravel garden.

CAUTION - Heat Guns Get Extremely Hot!

They may look like a hair dryer, but will cause a fire or severe burns. Keep away from children, animals, etc. Be sure to put on a non-flammable surface after use to allow to cool.

Step 3: Stir and Heat

Now you are ready to begin roasting coffee beans.

Be sure to have your oven mitt on and spoon in hand. Turn the heat gun to high and hold it approximately 2-3 inches from the beans at a slight angle. Stir the beans vigorously and continuously with the wooden spoon, while moving the heat gun back and forth over the beans. Do not stop moving the gun or the beans will char and burn.

We added this video so you can see the speed to stir and the proximity of the heat to the beans.

Watch the Color Change from Green to Delicious in 10 - 15 Minutes

Here you can see the color transition the beans will go through as you roast. They start out green in photo #1 and we roast to med-dark in photo #6

Once the beans begin to turn color, as in photo #2, it is time to reduce the heat gun to its lower heat setting. As all heat guns behave differently, you may have to adjust this.

The two videos below allow you to hear the cracking of the beans. The first crack will take place in photo #5, while the second crack is heard when the beans reach the color of photo #6.

First Crack Sounds

As the beans get closer to being done, they go through a first crack. The beans are actually expanding, and they make a sharp cracking sound as water escapes in the form of steam.

Keep stirring and heating through this process. We only stopped heating for the 2 second video, so you could better hear the sound.

Second Crack

The beans will continue to heat and sugars will caramelize, oils will evolve, and a more muted second crack can be heard. This sound indicates you are almost done for a medium to dark roast.

Again, keep stirring and heating through this process. We only stopped heating for the 2 second video, so you could better hear the sound.


If you want a medium dark roast, like photo #6 above, stop the heating while second crack is in progress.

Finally, Cool Down Your Beans Quickly

Immediately after turning off the heat gun, pour beans into a cooling tray. We use a flat baking pan with edges so the beans can spread out, but not fall of the edges. This prevents the heat from concentrating. The beans will continue to roast themselves and overcook as long as they are hot.

Into the refrigerator they go!





Now That You Have Learned How to Roast Coffee Beans - Are you going to give it a try?

Are you going to roast your own coffee beans?

See results

Our Favorite Book About Coffee

The Art and Craft of Coffee: An Enthusiast's Guide to Selecting, Roasting, and Brewing Exquisite Coffee
The Art and Craft of Coffee: An Enthusiast's Guide to Selecting, Roasting, and Brewing Exquisite Coffee

The Art and Craft of Coffee is the perfect title for this book. We have read many books on coffee and this one is our favorite book about coffee book. It tells it all and as a bonus, it looks great on the coffee table.

We have one for ourselves, but it would make a great gift for any coffee lover, or anyone who is thinking about brewing their own.

 

Wait Before You Brew

Freshly roasted beans should set for 12 hours before grinding and brewing to get the maximum flavors.

After the Roast

The roasting process will increase the volume of the beans while decreasing their weight. Typical weight loss is 12 - 20%. Without a scale this would go unnoticed.

Once cooled, store your beans in a glass jar in the refrigerator. They say they are best if used in the first week. Ours have never lasted longer than this, so we can't verify that anything happens to the flavor.

© 2009 Rhonda Albom

Are You Going to Give Coffee Roasting a Try? - All comments and questions welcome

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    • CherylMeril2 profile image

      Cheryl Meril 12 months ago from San Francisco, CA USA

      Thanks for the info. I noted you recently updated the heat gun recommendation you don't have in the video. The 700 and 1,000 degrees seems a little high. First crack is in the upper 400 degrees. Can you explain why these high temps are okay? I've watched other vids and the gun actually touches the beans by the way, seems a little risky.

    • SusannaDuffy profile image

      Susanna Duffy 4 years ago from Melbourne Australia

      Hmm perhaps a little bit too outdoorish for me :)

    • profile image

      othellos 4 years ago

      Very interesting lens. As a coffee person I learned a lot from your lens. Thanks a lot:=)

    • profile image

      mwiener 4 years ago

      I'm interested in the heat gun. I will check amazon and local online store for htis.

    • Sylvestermouse profile image

      Cynthia Sylvestermouse 4 years ago from United States

      Wishing you a year of many new blessings starting with this one! Happy New Year!

    • Sylvestermouse profile image

      Cynthia Sylvestermouse 5 years ago from United States

      In celebration of Friendship Day 2012, I am returning to some of my favorite lenses for fun, sharing and renewed blessings :) Friends Still Make it All Worthwhile!

    • profile image

      toddmason69 5 years ago

      Try it with cacao beans!

    • ChrisShaefer profile image

      ChrisShaefer 5 years ago

      That is totally awesome and I love they way you build the lens. Very SWEET!

    • nolteq lm profile image

      nolteq lm 6 years ago

      great lens. I like coffee too!

    • Coffee-Break profile image

      Dorian Bodnariuc 6 years ago from Ottawa, Ontario Canada

      Wow, amazing. Not only that you roast them yourself but you do it with a heat-gun. Excellent how to!

    • profile image

      bogusroy 6 years ago

      And I thought I have seen everything...well done

    • profile image

      anonymous 6 years ago

      What an awesome site. Thanks

    • simplegirl lm profile image

      simplegirl lm 6 years ago

      OMG.....who knew you could accomplish this with a heat gun! One more reason for me to buy a heat gun! I am going to try this!

    • RhondaAlbom profile image
      Author

      Rhonda Albom 6 years ago from New Zealand

      @anonymous: Thanks for catching this. It is always amazing that I can proofread more than once and still see what I think it should say, rather than what is there.

    • profile image

      anonymous 6 years ago

      I think at the top of the page you wanted to say "You WON'T want them any other way".

    • profile image

      WriterBuzz 6 years ago

      I just found your lens. I like it a lot. Thanks for building it. Gave you a thumbs up.

    • profile image

      WriterBuzz 6 years ago

      Very nice lens. Thanks. I gave you a thumbs up, because it's a nice lens.

    • profile image

      WriterBuzz 6 years ago

      Very nice lens. Thanks. I gave you a thumbs up, because it's a nice lens.

    • jimmielanley profile image

      Jimmie Lanley 7 years ago from Memphis, TN, USA

      Wow! That is fascinating! I admire your "pioneer spirit" to roast them yourself.

    • WindyWintersHubs profile image

      WindyWintersHubs 7 years ago from Vancouver Island, BC

      I love coffee and I didn't know you could roast your own beans. I bet it tastes delicious. Lensrolling to my souvenir coffee mugs. :)

    • GonnaFly profile image

      Jeanette 7 years ago from Australia

      Like Ecolicious, I don't like coffee (except coffee cake) but I love the look of this lens. Nice job.

    • SoyCandleLover profile image

      BW Duerr 7 years ago from Henrietta, New York

      We have a commercial coffee roaster in our general area, and somehow the vague, but similar smell, of of burnt toast is AWESOME! Well done and very informative. Thanks!

    • Ecolicious LM profile image

      Penny Pincher G 7 years ago

      I love this lens and I don't even like coffee. This is so visually appealing I almost want to drink coffee. Kudos on the fairtrade tip. Very well put together. Blessing

    • Kiwisoutback profile image

      Kiwisoutback 7 years ago from Massachusetts

      This must smell incredible. A fresh pot of coffee smells good to me, I can't imagine what this smells like (and tastes like). Off to brew a pot right now!

    • profile image

      anonymous 7 years ago

      @jbarnhart41: I agree with you that this is a very informative information on coffee. I have no idea that coffee can be roasted right at your own home. I am a coffee drinker for a long time and I feel very happy to read various information about coffee. Some websites like http://www.oncoffeemakers.com really help a lot. Great post!

    • Faye Rutledge profile image

      Faye Rutledge 7 years ago from Concord VA

      This certainly looks easy enough! I'd be willing to try it, but I'm not a coffee drinker. I bet it really smells good though. Great lens!

    • profile image

      jbarnhart41 7 years ago

      I probably drink more coffee than anyone you will ever meet. I didn't even know I could do this at home. Excellent lens and great instructions! Blessed :)

    • SandyMertens profile image

      Sandy Mertens 7 years ago from Frozen Tundra

      Wonderful lens. Love all the step-by-step instructions.

    • lakern26 lm profile image

      lakern26 lm 7 years ago

      Fantastic lens, Rhonda! Love your pics and videos :-) I'm a big coffee drinker, but I get mine the old-fashioned way, straight from a can of Maxwell House. I'm sure it doesn't taste nearly as good as yours!

    • Sylvestermouse profile image

      Cynthia Sylvestermouse 7 years ago from United States

      Awesome! This is something I have never tried before and I love, no, I need my coffee. The idea of saving money really appeals to me too! Most Excellent Lens! Angel Blessed and added to my Squid Angel Mouse Tracks.

    • hlkljgk profile image

      hlkljgk 7 years ago from Western Mass

      you make it look so easy!

    • CrossCreations profile image

      Carolan Ross 7 years ago from St. Louis, MO

      Very well-crafted 5 star page for coffee lovers. A+

    • profile image

      Leanne Chesser 7 years ago

      Fantastic! This is an excellent description of easy coffee roasting at home. Blessed!

    • SusanDeppner profile image

      Susan Deppner 7 years ago from Arkansas USA

      Wow, excellent and well documented. The short videos with the sound are just perfect. Very good information! (Too bad I'm not a coffee drinker, I guess.)

    • MomwithAHook LM profile image

      Sara Duggan 7 years ago from California

      Fantastic lens -- I like the Feature Creep on this lens. :)

    • Heather426 profile image

      Heather Burns 7 years ago from Wexford, Ireland

      wow, I can't wait to try this as a caffeine addict. Great job!

    • cineteq profile image

      John Parr 7 years ago from Montreal

      Great lens, lensrolled and rated. 5 stars!

    • strayspay profile image

      strayspay 7 years ago

      Excellent lens Rhonda! Five stars.

    • KimGiancaterino profile image

      KimGiancaterino 7 years ago

      Thanks for demystifying coffee bean roasting! Blessed by a Squid Angel.

    • partyjulie profile image

      partyjulie 7 years ago

      Very Interesting Lens! 5*

    • AlisonMeacham profile image

      AlisonMeacham 7 years ago

      I had no idea this was how you did this! What a brilliant lens - Angel Blessings to you

    • seashell2 profile image

      seashell2 7 years ago

      Great lens, lots of useful information. My husband and I are big coffee fans! Just having my second cup of starbucks now! :-) Lensrolling to my All about Coffee lens!

    • CherylK profile image

      Cheryl Kohan 7 years ago from Minnesota

      This is just great and I think I'll try it...will have to wait until a warm day, though - lol! I have a heat gun that I've used for embossing craft projects...could probably use that, I think.

    • eclecticeducati1 profile image

      eclecticeducati1 7 years ago

      Neat idea. Thanks for sharing. Wonderful lens.

    • raegal75 profile image

      raegal75 7 years ago

      Very informative - thanks!

    • Christene-S profile image

      Christene-S 7 years ago

      Blessed by a SquidAngel :)

    • RhondaAlbom profile image
      Author

      Rhonda Albom 7 years ago from New Zealand

      [in reply to Ramkitten] I open a down wind window when Jeff is roasting and the yummy smell travels into the house.

    • Ramkitten2000 profile image

      Deb Kingsbury 7 years ago from Flagstaff, Arizona

      This is so well done! I know my husband will want to try this. Too bad it's too messy for indoors, because I'd love to have the house smell like roasted coffee for a while. We go to a local roasters and, though I'm not a coffee drinker, I sure love the aroma.

    • OhMe profile image

      Nancy Tate Hellams 8 years ago from Pendleton, SC

      Oh me! I think I can actually smell your fresh roasted coffee. I would love to around when you do this to enjoy the aroma. Great lens.

    • puzzlerpaige profile image

      puzzlerpaige 8 years ago

      I've been trying to make it over to this lens for weeks! Finally got here and so glad. Now Rhonda, you make this look easy. I'm wondering if I could do it too. Hubby uses heat guns at work everyday and has a few of them. The one thing I don't have is the beans. I'll be thinking about this you can believe that. I bet the smell is incredible!

    • aka-rms profile image

      Robin S 8 years ago from USA

      Interesting!

    • Michey LM profile image

      Michey LM 8 years ago

      Hi! This is very useful for 2 trasons:

      1) if you buy green coffee beans you can keep it as long as you wish

      2) when you rost them - you always have fresh coffee which smel great and is rich

      Thanks a lot, I think I still have some green from Jamaica, I'll try using your method.

      regards

      Michey

    • profile image

      Marelisa 8 years ago

      How interesting, I had no idea you could roast coffee beans with a hand-held heat gun. I live in Panama and we have great coffee here, but a lot of the coffee in the grocery store has been sitting around for months and has lost most of its flavor. I defnitely want to start roasting my own coffee.